It looks like in addition to the Audi A6 hybrid, Audi make make an Audi A4 hybrid. Unlike the A6 though, the A4 will have a different drivetrain. The A6 hybrid is front wheel drive only. The A4 may offer front wheel gas drive and rear wheel hybrid drive. This opens possibilities like on demand quattro and up to 37 miles on electric drive only. The regular gas engine and a TDI version will also be offered but the question of North American hybrid availability is still up in the air.