Could any of the "big names" who used to be in be making a return? Some people I'm thinking of are the likes of Stone Cold, Goldberg, Steiner (shudder!) or Hall and Nash? Maybe Brock (although if he even does get to come back, it'd be on ECW). Perhaps even Hulk Hogan... They could be brought in to bolster Smackdown's popularity and numbers.
Austin will probably pop up again come WM time. He may show up for short storyline if they kiss his butt enough and pay him zilions of dollars.
Goldberg, I doubt will ever go back to WWE. He has trashed them so badly since he left.
Scott Steiner is under TNA contract and I doubt Rick would do anything to help the ratings. (I don't think Scott would either frankly).
Hogan is a short term pop like for a WM or big PPV. By the way he walks, it looks like he can't even move let alone wrestle but he could return for s storyline I suppose but nothing long term.
Brock is a possibility. I suspect he will be back in one of the three brands eventually.
Rock and Jericho, two huge draws, look to be well beyond WWE now <img src="/images/graemlins/frown.gif" alt="" />