I've seen the show a couple of times when it was at LVH and a couple times at Tropicana and there were no special guests coming out at the end for any of the shows I attended.
The lineup does change here and there. The first time we saw it Howard Leese from Heart was one of the guitarists (Doug Aldrich was always the other one), but in subsequent shows it was always Jason Boyleston instead of Leese. The female was always the same when we saw it (Carol-Lyn Liddle), but she has now left the show completely. Other than that, it has pretty much been the same lineup -- Paul Shortino, Robin McAuley, Andrew Freeman, Jay Shellen, Michael T. Ross, Doug Aldrich and Jason Boyleston. Sometimes, Hugh McDonald from Bon Jovi is also there.
Actually, in the beginning there was John Payne, but they tossed him out for some reason (and he was one of the guys who came up with the idea for the show). I can't remember the name of the guy who has replaced him. Wait... it's Mark Boals from Dokken.
Great show no matter which musicians are there that night. If you like rock from the 60s - 80s you can't go wrong with RTRV.