I think USC will be in exactly the same position this year as next.
Regarding returning players... Reggie Bush and Lendale White are both sophomores. Their rushing game stays. They've got barely any WR's leaving, and have the deepest roster for that position in the country, IMO. The offensive line is pretty young, as well, I think. The defense should be the same, but in any event, it's coached by Pete Carroll who is an amazing coach. The biggest question is Matt Leinart. He was looking at a possible NFL draft... But after his lackluster performance against USC's biggest rival, UCLA, that may have taken away his Heisman and given it to Jason White who played amazing against Colorado. I think Leinart will be motivated enough to come back for his senior year and work for the Heisman.
I think Oklahoma next year will look very much like Texas this year. Incredible, explosive running game, pretty solid defense but not too much of a passing offense. They could still well make the MNC, though. Wherever they go, Adrian Peterson will be carrying them there.
It's definitley possible that the Vols could make a BCS game next year. But we have much to improve on. If we can secure the offensive line, get Ainge to learn the offensive scheme inside and out, and maintain our defensive pressure while getting the d backs to a respectable level, we could very well make the Sugar Bowl.