I think GT6 will be released for PS3... Two series per console?
Correct. Every PlayStation platform would have two GT games. For istance GT1 and 2 were released on PS1, so PS2 got GT3 and 4.
Well, my little wishlist:
- Less duplicates. Things like 3000GT SR and 3000GT VR4 is acceptable, but EU S2000, JP S2000 and US S2000? 👎
Agreed, too many domestic market versions are annoying. 
- More premium cars. If the number of Premium:Standard reach 50:50 or more, just get rid the Standards.
Problem is that take would take longer to make it.
- New awesome, complex tracks but also bring back the good old ones. El Capitan, Pike's Peak Long, Test Course, blah blah blah and a
touge track.
Even an American developers can do it, why Japanese can't? Sign me up. 
- New Astons, RUFs, Bentleys, Shelbys, Fords etc. Make a deal with Koenigsegg, Vector, Kia, Ultima etc.
I may neutral here...
- Tweak those awful shadows. And
slightly better trees.
There is a petition for a patch against bad shadow. 💡
- Hood view!
Agreed. 👍
- World map interface. That make the GT feels huge, massive.
GT4 almost did this.
Just my two cents.