If PD wants to focus on what they MUST improve in GT4 to make a dream GT5, they shouldn't think of:
1. better graphics - They are already the best, and even GT3 were never surpassed;
2. more cars - in fact, I think they should shave off many of the cars they already got (about 30 skylines and some other, mostly japanese). If they don't get Ferraris, Porsches, Lambos, Maseratis we can live with that as long as we get good driving and good racing with the cars available
3. more tracks - It would be nice, but this is definitely NOT what this game is lacking.
This is what they made from GT3 to GT4, and I would like them to really focus - from GT4 to GT5 - in this:
1. Better AI - no need to expain
2. more AI cars in race (at least double the 6 cars grids we get today)
3. Midrace saves - I really want to drive the full 24 hour races and I can't have my PS2 turned on for 30 days. With GT4 the only option I have left - besides using B-Spec
is to get some crazy friends and make the enduros over the weekends. Maybe this summer.
4. Also in endurance races, at least the 24 hours ones - Day-to-night-to-day cycles and random weather conditions, like in the old "Le Mans" PS2 game.
5. Last but not least - In GT mode, give us "leveled" grids with the car we picked from our garage, or create simple "rules" for cars allowed in every race and championship. As many have complained before, it is boring to carefully pick a car that isn't either too weak or too strong for each race. We get decently leveled grids in Arcade Mode, so it's kind of ironic that this doesn't happen in GT mode.
PS - Before anyone points this out to me, I'll clear that I know that "day/night/day races" and "random weather" are graphics achievements. What I mean when I say that graphics don't need improvement is that the tracks, scenarios and cars are polished enough as they are, so the graphics department should work on these other problems.