The game will include the 5 previous tracks found in the Japanese version, along with an old Gran Turismo classic - the High Speed Ring.
Drift Mode - The player’s drifting technique is measured based on drift angles, racing lines, and speeds within evaluation zones located at various turns on the course.
In Depth Car Tuning - Players have the ability to adjust the vehicle’s performance, including power, weight, tires and suspension.
Two-player Split Screen Racing - Allows players to race head-to-head against friends and foes offline.
12 tracks, split screen, 71 cars.
http://www.ripten.com/2008/03/06/gt5p-north-american-details-announced-split-screen-new-track/