I don't think it would be out of the question for Mark Hamill to reprise his role in the newly announced TV project just announced, He certainly isn't too 'big' and actor to knock back the opportunity, considering he's never been able to escape the shadow of Luke Skywalker it would be only fitting for him to return to the role that made him famous, and going by recent photo's where he has ditched the beard he still has the look to carry it off, and seeing as Anthony Daniels and Peter Mayhew have made careers out of their associations with the franchise, on the fan circuit I doubt you could keep either of them away from a project like this, I doubt Harrison or Carrie would have anything to do with it, but I think a storyline similar to Jedi Academy, where Luke searches the Galaxy recruiting a new generation of Jedi
could have plenty of possibilities.