Well, as it has just been anounced, GT3 will feature Australian and Belgium car manufactures.
I have found out that GT3 includes a \'Belgium Cup\' race, which will be raced on the Cort \'A derz (However it is said) track (This track is supposedly set Belgium). This info of course is NOT official.
Now, if POLYPHONY have done this for the Belgium cars, then they must be going to do it for the Aussie ones as well (THis is all hypothetical remember, but does make sense).
Why would they do it for Belgium and not Australia? It makes sense to me!
Geez, this is soooooo exciting.