I still think that we'll see the next step of Force Ghosts - fallen Jedi manifesting themselves in a physical (though not living) form. Wasn't the planned finale of ROTJ Obi-Wan and Yoda returning to protect Luke in the saber fight? Anyway, I'd like to see Anakin as a ghost speaking to Luke in episode VII, potentially Yoda in episode VIII, and Obi-Wan or Anakin or Yoda or (GASP!) Luke returning to a physical form from the ghost realm. I'm one of those kooks who wouldn't mind Luke dying in VII to mirror Qui-Gon and Obi-Wan's deaths, however as mentioned, Luke returns in XI though he does not come back to life. He is on some higher plane of existence in which he can move between the living world and the force.