Before we get into this it's probably worth reminding everyone that when it comes to "Star Wars," at this point, nobody really knows anything except J.J. Abrams, Lawrence Kasdan, George Lucas and probably Michael Arndt, who is likely sworn to secrecy about whatever work he did on "Star Wars: Episode 7" before being replaced. That being said, it seems Samuel L. Jackson is a pretty chatty fellow and has friends in the right places, so his contributions to the forever spinning rumor mill are worth paying some attention to.
Stopping by "Late Show with David Letterman," Samuel L. Jackson revealed that he recently spoke with Mark Hamill (on the set of Matthew Vaughn's "The Secret Service") and Ewan McGregor (rumored to appear as a ghost in "Star Wars: Episode 7") and both of them told him they're yet to be contacted by J.J. Abrams for the sequel. Jackson even says he pestered the director about a part at George Lucas' wedding. Hmm....
So has Hamill been written out of the sequel? That's the speculation that's running rampant at the moment in certain corners of the web, and everyone should probably just chill. Remember, Disney paid a handsome sum not only for Lucasfilm, but for George Lucas' treatments for the sequels and Hamill, Carrie Fisher and Harrison Ford have been rumored forever to be part of that storyline (and met with Lucas too). Are those elements being tossed out? We doubt it. Is it possible that Abrams and Kasdan could be reworking it? Sure. Maybe Hamill and co. won't be prominently featured until 'Episode 8' or 'Episode 9' or maybe nothing is firmed up yet because there's nobody actually officially signed on (as far as Disney says anyway).
In short: it's well over two years until this thing arrives and there are a lot hoops to jump through until then. But something tells us Luke Skywalker will be somewhere (maybe partying on Endor?) when the movie drops on December 18, 2015.