GSP doesn't wait long between fights anyway. they should be fighting around april even if he waits. If I were him I'd wait but keep busy training to prepare for the fight ahead.
But like ThaFranchise said GSP will probably want to fight Anderson if he manages to beat BJ and if not April is still a long time away.
I think Alves will probably fight on the UFC 94 card to build up the title shot.