I note that The Force Awakens is available in 3D or 2D. Was it filmed in 3D or is this a post-processed add on?
According to this ScreenCrush article from October 2015,
Star Wars: The Force Awakens, on the other hand, is available in post-converted 3D, with no 3D 70mm option (except for theaters equipped with IMAX with Laser, of which there are only 6 in the U.S.).
Essentially, the 3D is a post-processed add-on because of the choice to film parts of the film with IMAX cameras.
This article from SlashFilm.com confirms that
SW:TFA was shot in IMAX.
First we have the following picture from a tweet from Bad Robot:
Then a quote from IMAX:
We emailed an IMAX rep, who said the following: “All we can say at this point is that we can confirm that JJ Abrams is using the IMAX camera for Star Wars: Episode VII.” They also confirmed it is shooting film. So while Abrams made a big deal of shooting Episode VII in 35mm, he’s going even bigger too: 70mm IMAX.
This isn’t really a big surprise. A few months ago, IMAX announced that Episode VII was being released in IMAX. But that didn’t mean it was being shot in IMAX. These days, almost every big film gets an IMAX release, but only one or two a year are actually shot in the format. We can now confirm Episode VII will be shot and released in IMAX.