Yeah, I thought about that as well. But he also said it's not Pixar. It's almost certainly not some other Marvel thing if GotG is going into Epcot, as there is little else that could be used (not anything popular). So that leaves other Lucasfilm stuff, Disney animation or Disney live action as the realistic options (could it be some old Touchstone film?)
So, building on that thought, what could it be... Zootopia? Wreck-It Ralph? Bald Mountain? A new version of Toontown? Something like Tangled that hasn't gotten a ride? Can't imagine another Frozen ride.
Bringing back some old ideas like Roger Rabbit or Crime Stoppers? Some sort of Tim Burton concept like Nightmare before Christmas?
Is it possible that they might bring the Shanghai POTC ride to the States?