Here is an extended summary of some of the features from GT4P. These points are mostly those that were not brought up in the forums from ps.com, so there are some more basic, obvious points on gt4 which i will detail at a later date.

1. AI strength: I put AI on pro (highest level) and in most cars, i was able to pull out up to 10 seconds a lap on tracks that i don't really know. I hope AI strength will be increased or at least have them using better cars.

Here you can find the complete car list in Gran Turismo 4 Prologue

BMW
McLaren F1 GTR FINA (Long Version) '97
Concept M5

Daihatsu
Copen Active Top (J) '02
Mira TR-XX AVANZATO R (J) '97

Dodge
Viper GTS '98

Ford
Focus Rally Car '99
Ford GT Concept '02

Honda
BEAT Midship Amusement (J) '91
CIVIC Type R (EK, J) '98
HSC (37th Tokyo Motor Show Concept Car) '03
INTEGRA Type R 98 Spec (J)
JAZZ '01
NSX Type S Zero (J) '97
ODYSSEY L Type (J) '03
S2000 '03
Spoon Sports S2000 Race Car '00
Spoon Sports CIVIC Type R '03
Spoon Sports Fit Race Car '03

Here you can find the complete track list for Gran Turismo 4 Prologue.

World Circuits

* Tsukuba Circuit
* Fuji Speedway

Mistowe Tory

* New York
* Citta di Aria Hong Kong

Rajdowe Tory

* Grand Canyon