Salvador - Now the Keys won't play two "unique" sets a la Panic or Umphrey's, but they will mix it up. A good comparison might be the band playing First Ave tonight and tomorrow - Spoon. Two different setlists, yet a couple of repeats. I'm sure there will be a good dose of the new album on both nights.
Warren coming out and playing during the Keys' set? I'm not sure I can even wrap my head around that