There is some new info from a German games magazine called Play Playstation regarding San Andreas :

-Carl can attack enemies from behind after hiding and sneaking in the shadows.

-Carl can increase his stamina for the amount of time he can remain underwater for depending on his fitness and how much he practises swimming ( So if Carl is fat and rarely swims then he will not be able to swim for long , but if he regulary swims and is thin and fit then he can remain in the water for a longer period )

-The members of the Orange Grove Families ( the gang that Carl , his brother Sweet , Smoke and Ryder are part of ) will wear green clothes.

-The Ballas ( The rival gang of the OGF ) will wear purple clothes.

-Bicycles will move forward when the X button is held down , But tapping the X button will make CJ peddle faster.

-Carl can now roll to the side while engaged in combat.

-A choice of haircuts are available such as bald heads , dripping jheri curls , a towering flattop and the famous Afro haircut , but players will also be able to pick between a choice of beards and other facial hair.

-Players can now pivot the camera around the car to gain a better view.

-Models include 50% more polygons than those of vice city.

thanks to sean breen for submitting this.