Wait, back up a little. TFA was mastered in 2K? Wasn’t it screened at 4K? Was the DCP an upscale?
According to IMDB, it actually is 4K. http://www.imdb.com/title/tt2488496/technical
I was misled by this article, which says 2k http://redvdit.com/reviews/star-wars-force-awakens-blu-ray-review/
Well, IMDB is not a good source, either. I have no idea what resolution it was screened or edited in, but I had read recently that the editing was done in 2K. shrug
As for the Disney/Fox thing, I don’t think that would hold them back much for SW/ANH. If it’s likely that Fox would never let the first film go, it seems that the best thing for Disney to do would be to give in and accept whatever percentage Fox gets for that film, and go ahead and wait until the distribution rights change over before releasing V and VI (and new sets including the prequels). Assuming that releasing the OOT is something they have interest in, I’m not sure they would let some losses in IV’s profits (what kind of cut does the distributor get?) hold them back from making money on the full set.