Most of the info I've seen online so far from the press says 2k DI. here is a good technical one from the film's editor- http://www.definitionmagazine.com/journal/2013/2/19/winning-the-frame-game.html I would think they have their reasons. and probably 48fps was one of them. Getting the projectors to work by release day and rendering all that footage in time had to be a factor. Being able to critically eval the blu ray from 2 feet away----I see all the detail I want to see.