If GSP does indeed stay MW champ, Whitaker is the only one he should be fighting next. If he goes down to WW, then Woodley or a superfight with McGregor. Although I hope McGregor fights Tony next.
I could see JJ getting an immediate rematch, she did lose definitively but she defended the belt 5 times and I'm curious as to how she responds in a rematch. Plus there aren't a bunch of new challengers at SW who deserve a shot at the title.
Now that TJ is champ, I do want to see the MM fight. If he can make the weight and retain his skills, it makes for a really intriguing matchup. I suspect it comes down to money and I hope the UFC pays DJ to make it worth it.