IGC is here.
The new IGC rotation has been implemented already, ahead of the announcement.
Including BOSS 302 '12
Renault Sport Clio V6
Pontiac Solstice
Lamborghini Countach
RX-7 RZ
Sport Evolution (back already)
Ford GT40
Lotus Elise
and one of the Mitsu Lancers can't remember which one came back but they are all 3 available again.