Because i'm a moron, I decided to start the Cayman GT4 challenge before going out of town for a week.  Predictably, the time period to complete the event ended without me finishing it.

Does anyone know if the Cayman GT4 and the GT4 Renegades series will be unlockable in the future?  Its leaving my Pro Category with a big old 99%.  It seems like they have done similar events in the past to introduce new cars, and since i'm a fairly recent adopter i don't know how they have dealt with it in the past.