No, Peugeot is still there, but they only race here in the states for one or two races a year (Sebring and RA I believe). I somewhat agree with you though, while I'm sure Acura's new ARX-02b will be strong, this is their first venture into LMP1, while Audi's been dominating the class since the turn of the century. I'm sure the ARX-01b was a good platform to build off of but Audi has this class down.
Both will have brand new cars, Audi will have the knowledge to make it work for them more quickly though, in another season or two Acura's ride will be quick.
Of course, Audi is only racing a few races this season ($$ thing) so really I guess it'll be Acura dominating the class.