Ah, but 1 thing we need to remember is, just how many more JDM cars can PD, within reason, include in GT5 that they didn't include in GT4? There's no way we can really expect a giant amount of RX-7s, Skylines, NSXs, because they pretty much got the whole catalog within GT4. So, what exactly can they include, again within reason, that they haven't already touched? It's not like Japan released 300 worth while cars between 2005-2009. And think of the sports cars already within GT4.
So, we won't really be seeing any new Ford GTs, XJ220s, Zonda C12s, etc. What we, hopefully, should be seeing are C6 'Vettes, Zonda F & R, Ferraris & Lambos, the RGT & CTR3, etc.
I'm already not looking forward to inclusion of every new STi & Evolution or GT-R (which, thank god, are only 3-4 tops), or any new hybrid PD feels is worth putting (god, imagine 4 Prius'....). At most, I personally am expecting at least 100 new non-JDM cars, 60 of which will hopefully be super/sports cars.