Is this an april-fools joke that I've somehow missed untill now?
George Lucas: Well, you do raise a legitimate concern. The original actors are getting old. However, their roles won’t really be all that action oriented except for Luke Skywalker and Leia engaging in light-saber battles. Most of Han’s action will be piloting the Millennium Falcon during dog fights. I don’t think they will be too old. Mark and Carrie will be in their sixties while Harrison will be in his seventies.
Lucas answers fan question
Lucasfilms survey, including how much would you pay for deleted sceens
Another survey about 7, 8 and 9
Is a bunch of other stuff on the site that you can find thru the site, like rough outlines