I hope Luke isn't the baddy for VII (nor Leia). However, it sure would make for a tragic story about someone we care about if he did turn bad. Sound vaguely familiar? It's exactly what the PT should have set up for the OT, where we should have cared a great deal for Anakin (just as we do Luke) and then by ESB we learn for the first time he's actually alive AND the villain. Is that what JJ is trying to do, 1up Lucas? Again I'm hoping it isn't the case - to me it would undermine what Luke went through in the OT, VI especially - but we'll see. Whatever happens, I'm expecting it to be done well.

Warwick Davis is set to return in VII, according to here. He did make a cameo appearance in TPM as a brand new character, so his involvement in VII doesn't automatically mean we'll see Ewoks. But then again, it could happen, if a certain villain is indeed to "Alas, poor Yorick" over Vader's helmet. I won't mind the sight of Ewoks, so long as they're done right: more as cunning hunters and less cute n cuddly.