Wow so many people seem to want physical copies. If I get a collector physical copy of the game (I dunno yet if it will be a reward at all and if it will be in the tier that I planned to back), I'll probably just resell it.
I voted for the soundtrack and documentary. And I just want digital versions of those.
The only physical one that could be interesting is the artbook I think. It'd be a pain to read as an ebook if it has a lot of pictures.