Video of Killzone 2 multiplayer: (looks just as good as singe player!!!! which is damn gorgeous btw!)

N4G.com : GameSpot Video: Killzone 2 E3 2008 Stage Show Demo

Clan support sounds amazing, and the badges system is very welcome with the succes of MGO's "create-your-own-class system"
Im guessing this game will definitely get dedicated servers as its one of Sony's flagship titles (see: RFOM etc)

Now lets hope the single player is a lot lot lot better than the first Killzone. It definitely looks like its going to be better, but im still waiting on this one.