@Matt Orr I think it's Indy or Nascaww, and if it's Indy I think they'd have to relicense the historic material, unless they threw a changeball on us and took it away from the rF2 licenses.
I have a feeling Indy as a whole is flexible enough at this moment given they appear just about everywhere and seem to be willing to play ball. It'd be mutually beneficial at this point as well, both ISI and IndyCar could really benefit from a quality IndyCar focused title.