Gamespot have put up their preview of San Fierro, so go an check it out. It mentions things about the new types of transportation and weapon skills plus more.
Link: Tales From San Fierro
I like the fact that you can pick the color and car parts on some of the cars in the game. For once I don't have to go back and in just to get the right color. That kind of gets me thinking. If you can get car parts and tattoos, I'm just wondering, when the PC version comes out, will people be making their own tattoos, car parts, wheels, and maybe even clothes? We'll just have to wait a long time to see.