Unless she performs more songs she will have to cut some from the current set list and if she adds in songs from B9 too than the entire set list could be way different
I can see Womanizer and/or Circus (hope they keep Circus tho), 3, Stronger (nooooo Brit don't!!!), PG and Perfume all going. Maybe Boys too tho she loves it too much I think.
She's gonna have to do some major changes if she wants people that have already been to go again, but unfortunately I don't think she will. Oh well, she seems extremely happy and is improving all the time with her performing so Vegas is good for her. I just hope after the next 2 years is up, that will be it for Vegas