obviously serra is next, but after that it gets convoluded.
Lets run through the potential challengers and what they might have in front of them.
Hughes - he could ask for a rematch right away(after serra) and be granted it but I think both he and the UFC would like to see him fight someone in the meantime. I personally would like to see him fight Penn and the winner would fight GSP.
Diego - obviously has to beat Riggs to even be considered in this discussion. If he does win I think he should have to defeat Hughes or Penn and then get a title shot.
Penn - BJ is the enigma here. I don't think anyone including BJ knows what weight class he's going to fight in. If he stays in 170 I think he has 2 fights before he gets a title shot. Somebody, no idea who, and then Hughes or Diego in a #1 contenders match.
But I am forgetting one person here... Serra lets look at it in the case he does win the title. LOLOLOLOLOL
I can't even finish that thought.