Check out Red Bull GT5 video:
Few new features:
-“Gran Turismo Anywhere” will allow you to manage B-Spec races, right from your computer. You’ll be able to hold B-Spec races with your friends from anywhere in what are called “Remote Races”.
-Point-to-point rally stages will be automatically and randomly generated – you’ll have to depend on your co-driver to give you the best instructions about the road ahead.Rally mode can be played either on or offline.
-Karting Experience, The AMG driving school, The Stig Challenge, Jeff Gordon NASCAR School, Sebastien Loeb Rally Challenge, and Gran Turismo Rally.
-Falling rain and snow. Rain at night is confirmed.
-Active windshield wipers
-Weather changes include temperature differences, air pressure changes, and humidity, affecting the surface conditions of the track dynamically.
- Weather conditions are randomized. Forecasts for your race will be available but may not be entirely accurate, just like the real world.
-Polyphony Digital has worked to improve engine sounds.
Here is another video in low quality which shows weather effect!