As well as the maps (which you will have to buy £££)
There is also an update coming with the following
* Quitters will now be persecuted and have to wait up to 15 min before they can play online again
* Chimera vs. Chimera will no longer exist!
* Unified servers (Europe, US and Australia areas playing together)
* Teammates' names will be more visible to see!
* Report cheaters to in game moderators during the game!
* Also there will be new skins and a different look to the Chimera
More information from
http://uk.ps3.gamespy.com/playstatio.../792120p1.html
Europe will be delivered shortly after US launch.
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Should make the game a little more interesting. Just got to buy the maps if they become popular.