@stage
there wont be piracy =/
On topic:
I think it can sell around 4-5 million copies LTD.. if it is reviewed well..
FF XIII lost a bit of its sales because of the lowish reviews..
I suspect Versus XIII will be the better game because it's being developed by Tetsuya Nomura. It also feels more like FF VII/Kingdom hearts II which could get more people on it. It certainly should outsell FF CRISIS CORE which sold like 2 million copies "I think".