I don't think the new coach factor will be that big of an issue... He's already coached in a tough conference, in a division that rivals the SEC East in strength. I'd say he did pretty darned well in Stillwater considering which program was just across the way.
As far as LSU's talent goes, they look great in every area except QB, which is a question mark but may turn out fine. Alley Broussard and Joseph Addai are both studs, and the combination of them IMO represents a bigger threat than Riggs. As good as our front 7 are going to be, they will still have a heck of a game stopping LSU's run game. The pass game might be a bit tougher to stop though, but it all depends on how much support our DB's can get from the pass rush. JaMarcus Russell is talented but relatively inexperienced, and we will need to pressure the heck out of him. LSU has a pretty darned good offensive line as well.
As for us, scoring is gonna be pretty difficult. LSU's front 7 is nearly as good as our's, so our OL will have to hold up. Their DB's should rival our receivers, so I think we will see limited success on the pass. It should come down to Riggs establishing the run. He's gonna have a tough time burning LSU's defense, but if he can I think we got it. Then again, Auburn's defense last season was tougher than LSU's should be this season, and Riggs tore it up in the SECCG. So we will find out.