Okay, a list of things mentioned here, that are not featured in the changelog:
 - Improved clutch
 - "TThrustmaster" typo fixed
 - Car sorting in garage will be saved
 - Restart option after finishing a race
 - Corrected taillights on the '91 Acura NSX
 - Improved force feedback on the RedBull X2010
 - Improved loading times in the car dealership menu
 - You can now export all your photos to the XMB at once
 - The rev meter in the Mazda RX-7 (FC) '90 and the gear display in the NSX GT500 were fixed
 - Slight shadow improvements
 - 16 cars on-track in Arcade Mode
 - Set-up menu now called "Settings" instead of "Tuning"
 - Smoke/spray pixelation around the cars improved
 - RE-Amemiya RX-7 sound improved
 - Laps, restrictions and other infos are now displayed in the online race browser
"Thank you PD, for pimpin' my GT5!"