Soundtrack:
-Details: 11 functional radio stations, 20 different DJs.
-"More licensed music than in any other action videogame in history."
-"Instead of looping the sounds heard on each station, the entire setup is dynamic."
-"Players can expect to hear live weather bulletins, deadly accurate news updates, music blocks, custom track lead-ins and outs, and call-ins from people all over the state."
-Three times the amount of commercials in GTA3.
-Music will sound different depending on your car and its stereo.
-You will be able to buy the soundtrack standalone in two versions, both available November 23rd.
-Double album with highlights from each station.
-Giant box set with 8 CDs.
-One new radio station in addition to the ones mentioned earlier: WCTR talk radio. The DJ is secret (aka Lazlow?) as is all other information about it.

After the online multiplayer rumors were shot down by Rockstar, new ones emerged from magazines stating there will be a two-player, co-operative mode. We now have more information on this rumor.

SPOnG.com visited Rockstar offices yesterday for a demonstration of San Andreas, and they decided to pursue these multiplayer rumors. After hearing the same lines from Rockstar reps about no multiplayer functionality, they did manage to pay close to attention to the game and are able to bring us this new info:

There will, however, be a dedicated co-operative mode for two players. During the game, a scene ensues when the player rescues a girl from a burning building. After this act of gallantry, she becomes your in-game girlfriend and also, a playable second character. Most of the co-op action takes place inside vehicles, with player one driving and player 2 shooting. When the co-op mode is opened, icons will display the missions available to two player on the game's map.

What's more, a plethora of two-player minigames will be included in San Andreas. Unfortunately SPOnG has no specific details regarding these right now, though we can confirm that various parlour games will be included.
- SPOnG

To sum it up:

* Dedicated two-player experience for a second player to join in.
* CJ will rescue a girl from a burning building, they engage in a relationship and the girl will be playable (probably using second controller).
* Co-operative features include one person driving and the other shooting, and a range of other mini-games.
* When co-operative mode is enabled, icons will display two-player missions on the map.

That means a whole new playing experience, with co-operative mode for a second person to join in! Add this to the already existing information about the huge state and three cities and I think Rockstar has gone beyond anything we were expecting