So Aston & Holden did make it in before launch, but got removed somehow
Oh well, let's hope they're back in GT5
On a sidenote, I tried to research more about Autobachini, but all I could find using Google are 4 links, and one of them is this thread! What an obscure manufacturer
BTW, could this be the explanation for the discrepancy in this thread?
https://www.gtplanet.net/forum/showthread.php?t=127885
That's because at Tokyo R246 there's a large Maserati ad/poster on one of the buildings. I forgot the exact location, but it's there. This doesn't mean you can find actual Maserati cars in the game itself (it will be in GT5 though, thankfully).