Didn't see that one coming.
Incoming, Audi #2! Magnus Racing going to a new R8.
http://www.racer.com/imsa/item/123291-imsa-magnus-racing-set-for-audi-switch
Updated GTD roster (
bold=confirmed 100% in):
Audi, 2
Porsche, 3
Lamborghini, 3
BMW, 1
Viper, 1 (2 for the NAEC)
Mercedes, 1-??? (Barring delays, Daytona is questionable, Sebring and beyond confirmed)
Lexus, 0 (coming 2017, some 2016 races possibly with 1 car)
Aston Martin, 0 (TRG-AMR focusing on PWC)
Ferrari, 0
Mclaren, 0
Cadillac, 0
Total: 11-12 cars, 6 manufactures