Rumor mill alert
A couple of interesting rumors popped up during my research trip over the weekend. First up, there's a hot rumor circulating that George Lucas will make an appearance at some point during Star Wars Weekends (the final weekend has been mentioned a lot, but nothing is certain) while he visits to take a look at progress on Star Tours 2.0. It's likely that the reinvigorated development for a new version of the attraction is linked to Disney's attempt to convince Lucas to let them broadcast the upcoming live-action Star Wars-based television series (Warner Brothers won the battle to show the "Clone Wars" series.)
The second rumor is that, following the use of the old Hunchback theater at the Streets of America backlot for the Star Wars Weekend talk show events, it will be reconverted to house a Nightmare Before Christmas-based dark ride, as seen on the Disneyland and More blog (link). If this comes to pass, it will complement not only Disney's Christmas offering, but the more intense Halloween after-hours event they are trying to push for the Studios. In addition, it would help the transition of Grad Nite events to the Studios.
The final rumor involves space adjacent to Toy Story Mania. This one says that there will be a Cars-themed attraction there in time for the release of Cars 2 in 2012.
Those are rumors, not confirmed, so take them for what they're worth.