Which SW legacy actors will they 'force' into this?

Mark Hamill, BDW (probably be killed off), Anthony Daniels (and R2/chewie) will all be a dead cert (probably Yoda and the Emperor again as well)

But also Hayden, Ewan, Liam, (maybe SLJ) as force ghosts/flashbacks as I imagine the plot will involve Rey somehow revisiting stuff to do with the prequel trilogy (as the PT is now all popular in a retro/nostalgic way with now adults who grew up with it as kids. like the way the OT was with the older gen and who the ST was made for)

And obviously we'll see the ST actors back Issac, Boyega, Tran (but Driver will most likely refuse)