I think it would be neat to see a Disneysea in Florida... I just wonder if the concept would be too similar to what's already in Epcot and AK (Think Nemo show, the seas and the lagoon concept)... they would have to tweak the lands in the US and maybe move/ remove certain attractions there
I know a Villains idea is often brought up, but I cant see Disney doing that, nor a Marvel Park, Disney doesn't like to put too many eggs in one basket in terms of IP (think Star Wars)