Here are 21 things you need to know about the new Steve Jobs movie:

1. Danny "Trainspotting" Boyle is the director of the new Steve Jobs movie.

We really couldn't ask for a better director. Danny Boyle has a great portfolio of work: Slumdog Millionaire, Shallow Grave, 28 Days Later and Trainspotting. Not to mention he directed the spectacular 2012 London Olympic Games opening ceremony.

2. The film's writer, Aaron Sorkin, created The Social Network, A Few Good Men and The West Wing

Aaron Sorkin wrote The Social Network, a tech-world movie which was everything that 2013's Jobs biopic wasn't. Sorkin wrote a tight story about the founding of Facebook and the tension Mark Zuckerberg's success caused amongst his friends at university. The Social Network is a haunting, chilling and tense movie about friendship, power and success.
Sorkin's body of work is incredibly impressive. It includes the highly successful Tom Cruise movie A Few Good Men and The West Wing, one of the most acclaimed TV series of the past 20 years.
He has also made The Newsroom, which we think is a bit self-important but has some reliably good lines in it, and the (in our opinion) criminally underrated Studio 60 On The Sunset Strip. Give that a look if you can.

3. The new Steve Jobs movie is based on Walter Isaacson's Jobs biography...

Walter Isaacson, whose authorised Jobs biography is a great read that packs in the whole story of Jobs' life and is essentially the definitive volume on the subject, is credited as a co-writer of the new Jobs movie. Although how much writing he is doing on the film itself is unclear - it may simply reflect the debt that the script owes to his book.
We hope Isaacson plays a significant part in the production. Aaron Sorkin is a highly creative and imaginative writer (there were more than a few complaints from the parties involved that The Social Network plays fast and loose with the facts of Facebook's early history) but the involvement of Jobs' biographer would help ensure a movie that is gripping but also stays true to the source.

4. ...but it also includes insight from Jobs' daughter Lisa Brennan-Jobs

The Jobs movie was to be directly adapted from the Isaacson biography, but it appears that screenplay writer Aaron Sorkin has been looking elsewhere for inspiration: Steve Jobs' daughter Lisa is to play a big part in the Steve Jobs movie.
Lisa Brennan-Jobs was estranged from her father for part of her childhood as he refused to acknowledge that she was his, although she later went on to live with his family. She didn't participate in the writing of the Steve Jobs biography because her father was alive at the time and she didn't wish to cause a rift in her family, but she has been working with Sorkin on the screenplay for this film.
Sorkin describes her as "the heroine of the movie". He explained in an interview with The Independent that what drew him to the Jobs story was "the relationships he had - particularly with his daughter, Lisa".

5. Michael Fassbender is to play Steve Jobs...

Perhaps best known for his role of Erik Lehnsherr/Magneto from X-Men (the more recent movies with the younger Magneto), although he has an impressive CV across a variety of roles, Fassbender looks like a good choice to play the charasmatic Jobs.
Fassbender's work includes 12 Years A Slave (for which he was nominated for an Oscar), Inglorious Basterds, Prometheus and Shame. Fassbender also starred as Carl Jung in A Dangerous Method so he clearly has practice playing intensely intelligent characters.

6. ...even though Aaron Sorkin didn't want Michael Fassbender

When Sony was hacked at the end of 2014, emails were leaked that claim Sorkin was rooting for Tom Cruise, lead role in recent films including Edge of Tomorrow and Jack Reacher, to get the role of Jobs.
When Michael Fassbender's name was brought up, Sorkin apparently labeled the decision as "insane", following up by saying, "I don't know who Michaeal Fassbender is and the rest of the world isn't going to care." Ouch. Of course he eventually warmed up to Fassbender, admitting that he is a "great actor".
When talking to the Associated Press, Fassbender remarked that he had tried not to take the dig too personally because "People have opinions. The internet is the internet. I have a job to do, so I just get on with that."

7. Christian Bale pulled out of playing Steve Jobs in the new movie...

At least two big-name actors - that we know about - pulled out of playing the role of Steve Jobs. Some speculated that the intimidating script may have been something to do with it (we heard that it's a 181-page script, with about 100 pages just for the Jobs character), although we'd have thought that would be a challenge that most actors would relish.
Whatever the reason, Christian Bale pulled out of the role of Steve Jobs. Bale, most famous for playing Bruce Wayne/Batman (er, spoiler alert, possibly?) in Christopher Nolan's Dark Knight films struck everybody as a good choice for playing the charismatic entrepreneur. (Bale also played Patrick Bateman in American Psycho; no comment on whether that would be an advantage or disadvantage...)
But Bale got cold feet about the project, citing "conflicting feelings". Apparently he thought he was not right for the role.

8. ...and so did Leonardo DiCaprio

The Wolf of Wall Street star is another big name that was linked with the title role, having previously worked with Danny Boyle on The Beach. It's thought he quit the movie because of a scheduling conflict.

9. Seth Rogen is Woz

Seth Rogen is set to play Steve "Woz" Wozniak. Rogen is an interesting choice as he is a comedian, with roles in films like The 40-Year-Old Virgin, Superbad and Knocked Up - not to mention the recent dictator-annoying North Korea flick The Interview.

10. Kate Winslet set to play Joanna Hoffman

Kate Winslet is to play Joanna Hoffman, one of the original members of the Macintosh and NeXT teams.

11. Natalie Portman was 'in talks' to play a lead role... but apparently also dropped out

Natalie Portman was said to be "in talks to join Universal's Steve Jobs biopic", according to Deadline. It was thought that she would take a major role, perhaps that of Steve Jobs daughter, Lisa Brennan Jobs (see above), or Lisa's mother Chrisann Brennan (but see the next entry).
However, Portman got cold feet and turned down the role – what is it with this movie?

12. Katherine Waterston cast as Chrisann Brennan

Katherine Waterston is to play Chrisann Brennan, the mother of Lisa.

13. Jeff Daniels to play Sculley

Jeff Daniels, who worked with Sorkin on The Newsroom, has taken the role of former Apple CEO John Sculley.

14. Michael Stuhlbarg takes on role of Andy Hertzfeld

Boardwalk Empire's Michael Stuhlbarg is said to be set to play the father of the Macintosh, Andy Hertzfeld.

15. The film was going to be made by Sony, but Universal has taken the reins

Sony was originally going to make the film, but pulled out. Instead, Universal is running the project.
We understand that Sony didn't drop out because of the way the iPod flattened the Walkman. Instead, it was other commitments.
Sony bought the rights to Walter Isaacson's biography of Steve Jobs after Apple's co-founder died in 2011.

16. The script is divided into three parts...

The script is believed to be divided into three acts, following Jobs' preparation for three Apple product launches spanning 16 years.

17. ...but is top secret

Speaking of the script, it's been reported that those auditioning for parts didn't even get to see the script. It's so secret that they had to read scenes from Sorkin's Newsroom series instead.

18. The movie is based around the Macintosh, Next Computer and iPod, but not the iPhone

These are rumoured to be the original Macintosh, Next Computer and iPod. Many Apple fans may wonder why more recent products, such as the iPhone and iPad aren't included. These three products define an important arc of Jobs' relationship with Apple (the computer that defined his original success, the time when he was ousted from Apple, and the device that marked Apple's rise in fortune).

19. Shooting for Steve Jobs was set for winter 2014, but was delayed until spring 2015

The film was due to start shooting this winter but with the changes at the helm, and the fact that Fassbender's involvement was only confirmed at the end of November, it was delayed until Spring.

20. Watch the first teaser trailer for the Steve Jobs movie

The first teaser for the biopic finally arrived after much speculation that the film wouldn't get a 2015 release. While it doesn't reveal too much about the storyline, it gives us a glimpse of Fassbender in character as Steve Jobs preparing to give one of his trademark keynotes.
As well as seeing Fassbender as Jobs, we saw Seth Rogen as Steve Wozniak, Kate Winslet as Joanna Hoffman and Jeff Daniels posing as the former Apple CEO John Sculley in character for the first time since taking the roles.

21. When is the new Steve Jobs coming out?

The film is to be released later on this year, on 9 October.