Orton vs Rock won't happen. Rocky would just obliterate him on the mic and they've definitely stopped Ortons push somewhat as he's been jobbing to Big Show and Del Rio recently. Vince seems to be fed up with him.
I can't even imagine Rock in the Chamber, especially if he's in with a load of geeks like Kofi Kingston and the other small timers they use to feel that match usually.
Would be cool to see though.