Alright, the individual my guy got this info from is making it public elsewhere, so I’m going to say it’s safe for me to share it here too.
The word is that Paramount destroyed all of the original IMAX 70mm prints of Interstellar that were returned to the studio after the original 2014 release, hence why the only currently existing prints are with theaters that have the space to keep a massive print themselves in storage. Chris Nolan didn’t approve of this, so now he’s furious. He requested that Paramount put up the money to produce new prints, and they refused. So after that spat, it looks like the whole thing may have been called off (again, save for the few that can play it themselves, but it doesn’t seem there’ll be much “official” about those runs).
Christopher Nolan is pretty passionate about film. As far as I’m aware, he won’t shoot on digital
No, but you can transfer the film into digital and get pretty close in quality in a much smaller form factor.