Fox has video distribution rights. I think they could play it in theaters without Fox's consent. V and VI could apparently be distributed digitally without Fox?

But I think an important point that people sometimes gloss over is: would Fox try to withhold this? Why would Fox try to withhold this? Would they simply not want to put money into it themselves? I can see why Disney might not want to go through with it until Fox's rights expire (or are otherwise dealt with for IV), but I can't quite see what Fox has to lose, here.