Dan, your wish has been granted for LMP1.
http://forzamotorsport.net/en-us/february_ALMS_pack/
I'm on the fence with running in the GTC category. I love the car, and I didn't want to race in the class with only 3 people (if one doesn't show up, it gets really thin). With the change in the number of players, I'll have to think about if I want to switch.