Theme Park Insider brings us the following, after telling us of Disney's plans:
So what about Star Wars Land? The logical places for that expansion would be on either side of the existing Star Tours ride. From what I've heard, it appears that the expansion would take out the area between Star Tours and the auto stunt show stadium, including the Muppet theater and Honey, I Shrunk the Kids play area. But I've also heard of consideration of going in the opposite direction, which would place the new land on the site of the Backlot Express restaurant and Indiana Jones stunt show theater. Given that the Indy theater's used for several other events throughout the year, and that both the Muppets and Honey I Shrunk the Kids attractions long ago passed the height of their popularity, I'm hearing more forceful arguments for the first option.
This appears to be a five-year project, putting completion in 2018, though Disney could choose to throw money at it and accelerate it by a year.