GTplanet is reporting Gran Turismo 5 will have weather and track editor.
"Gran Turismo 5 will offer gamers an experience more rich, more in-depth and more exciting than they might expect – even from a series as closely identified with innovation and invention as Gran Turismo. Not only will Gran Turismo 5 deliver an even more comprehensive set of cars and courses than gamers saw with previous iterations, it will also feature new game-enhacing graphical effects such as damage, night racing and weather.
These innovations are twinned with the option to join millions of like-minded individuals globally within the Gran Turismo community and to find a driving experience to suit, whether that is taking on the Top Gear test track, chucking cars around stunt arenas, go-karting, creating and sharing your own track or intense head-to-head races. Who, where and what to drive is completely down to the individual.
This time around Gran Turismo is likely not just to be the definitive driving experience but a definitive gaming experience full stop."