Quick info on San Fierro.
Some quick points: there is said to be about 150 missions. The triads are back and they hang out around China Town. Wu Zi Mu is a leader of the Triads, who just happens to be blind.
There seems to be that they're putting in a Woodstock type festival called "Hushbury & Garcia Joint Festival" which will be populated by, get this, hippies.

Not only hippies, but hippies driving VW Buses. Or remakes of them at least.
Couple more screens as well. One that suggests CJ will be able to highjack the trolley carts. There could also be car customization. Instead of just being able to select the color of the car, you might be able to select spoilers, nitrous, etc. and get the blur effect when you push a button while driving.
That's pretty much it but some good stuff. Just keeps getting better and better.