iRacing now has the MX-5 cup car
 

This was the preview video they made a week ago, it and the Williams F1 car were made available on the 27th.

http://www.youtube.com/watch?v=Ib_DQMH3N10

http://www.youtube.com/user/iRacingTV

MX-5 is now the new rookie car, so if you begin now, it is available to race from the beginning

And for those that are going "iRacing what?" here is the video for you

http://www.youtube.com/watch?v=WeE1yO5fggY

dammit! I posted this 2 weeks ago...and the Williams F1 car is available