After playing GT solidly for a day or so I've come to these conclusions.
FWD is massively improved, theyre a whole lot of fun. Car sounds are also more improved than I originally gave them credit for, alot of cars have been re-recorded and you can actually tell that your passing a different car. Even on my dodgy $40 logitech setup (PS3 is no longer in my loungeroom)
Skylines still sound lame....even with a few grand of mods. my 800hp 33 GTR is nuts fun to drive but doesnt sound angry enough.
AWD is also better, the above mentioned 33 drives much better with that HP than previous games. You can steer and tickle the throttle without just driving straight ahead.
Cars can now be lowered!!! dumped even in some cases. this and the adjustable Nos takes it back to oldschool GT
Musically this is the worst GT ever.....the menus used to be a nice loungey place to be, now just a little anoying. and most of the in race/replay music is just crap. Going to add my own music this weekend.
The moon buggy thing is just plain stupid and entirely boring and un nescessary
All in all very happy with it, especially goodwood, bathurst, Nurburgring, and load times!