I can't say I'm too excited about the idea of seeing Ford, Fisher or Hamill return but we'll see what happens.
I haven't read any of the books but as I understand it [correct me if I'm wrong please] but doesn't Han's son become a sith Lord and then Emperor at some point?
There may be a role for Han to play in that downfall as his son turns to the dark side?
I have no idea, I've never read any SW books.
Outside the movies my only experience is with the KOTOR games and the Force Unleashed games.
And to be honest, with so many SW movies in the plans I would very much like to see some of them set in those "universes" than just see what happened to various characters from the OT.