I wouldn't be surprised if they play a few of the Survivor songs there also....whether they would be released or not is a different question, but for those that have heard the past shows, you have heard....."Summer Nights", "Poor Man's Son", and "Somewhere in America" with Chalfant on vox....and a few more with Peterik handling lead vox.
As far as Peterik in Survivor again, I wouldn't cross your fingers, but stranger things have happened like the JJ/FS reunion, so I guess anything is possible...

Kevin