I made an extremely long post last night only to have my computer freeze up on me and lost everything.

I"ll just summarize what I posted last night because I don't feel like typing it all out again...
What I expect from PD? I'm hoping some of this won't be true but here are my thoughts on it. There will still be no damage physics in the game nor will there be any exterior modifications with the exception of rims and maybe the ability to repaint your cars. The AI will be improved from previous installments (it has to). Sounds will be a lot more realistic and true to life than previous GT games and there will still be no thread marks on the tracks or grass. Physics will be improved, I have no idea to what extent but I'm sure it will be improved. That's pretty much it aside from what they've already leaked out to the public.
What I think should be in the final game if they want to reclaim the throne...
Doesn't have to have 700 cars just as long as they have iconic cars and a lot of the cars that car enthusiasts would love to modify and race. Have exterior modifications on the cars beyond just changing rims. Vinyl arts, custom pearlescent paints and different body kits would be nice so when we race online, our cars will be unique from one another.
Graphics are great as it is but a few things should be added. Engine sounds have to be greatly improved with distinction between fully loaded, part throttle and engine braking. Power adders should be true to life and on pops and cracks on race cars or fully built street cars. A race or built engine should sound like it's about to explode, in my opinion.
When you lose traction, there should be thread marks on the tracks and in the grass if you happen to go off course. Lots of smoke would be a lot of fun for days when we just want to drift around the track instead of hot lapping or racing. Damage physics (performance and cosmetic) should be implemented to the cars to make things more interesting and for people to race more responsibly.
Overall physics engine has to be improved and the AI cars should have to follow by the same physics law that we do. Tuning should be improved greatly with more in depth adjustability. The ability to change individual tire pressures and suspension settings, not just front and rear. AI will have to be smarter and have great collision detection because there is no excuse not to have improved AIs. Especially with Sony always boasting about how great the CELL is when it comes to artificial intelligence in the games.
Last and most important thing they must do is to make full use of the Logitech G25 steering wheel!!! If you're going to make a "real driving simulator" you have to do this or it won't be one. If you don't give a manual transmission car enough gas, the engine should sputter, the car jerks and engine dies if you don't engage the clutch right away. Things like this is a must, in my opinion, when it comes to a real driving simulator. Ferraris with paddle shifters should make full use of the paddle shifters and same goes for cars with sequential shifters as well.
That is all I ask for in this 5th installment of the Gran Turismo series and I'm hoping that Kazunori Yamauchi will satisfy my needs. I have a lot more but I don't think it would be possible with current generation consoles. Maybe when a PS4 or PS5 comes out when I'm old and gray.