Personally, I want Star Wars Land! I know people complain about lands based on a single franchise but if you were going to do it (or at least going to do it a 2nd time) there is no better choice I think than Star Wars Land. You already have one ride, store and show. I think the show should be moved into the Captain EO theater and expanded upon. More characters, maybe some AA's. Astro Orbitor gets moved atop of the tower and the rockets changed to X-Wing Fighters. Buzz could be re-themed and taken into many directions. Perhaps a Rebel Alliance training exercise ride. The idea of using Buzz's guns to shoot non toy aliens doesn't seem very Disney. I know there are space ships shooting each other in Star Tours but Disney seems to frown on that kind of gun violence. I would be happy if they just turn it into an AA heavy dark ride like Escape From Jabba's Palace ride with a Jabba AA somewhere in the mix and no guns or scoring used. Redd Rockett's could be themed to the cantina bar in A New Hope with an AA cantina band playing. Space Mountain is such a broad concept that I think it could work without a retheme. Maybe just retheme the queue and loading station to more of a 1977 A New Hope look and perhaps a John Williams score in the speakers. And to top it off, the Peoplemover track could be used as a tour of the Star Wars land!
With that said, the new E ticket could then be either a speeder chase style coaster to a huge Haunted Mansion/Pirates level dark ride.
None of this is ever going to happen but it would be awesome if it did.
I second that the attraction coming to Tomorrowland will probably be The Avengers. Probably be ready when the second movie comes out.