It has multiplayer, yes. Up to 8 players if memory serves.
Nothing new since WC3 did that too as I recall...but after that expansion, Dawn of War will have 7 different factions to play.
Space Marines, Chaos Space Marines (which actually play differently, especially at the high end), Eldar (think elves), Orks (greenskins ftw!), Imperial Guard (the poor bloody infantry), Necrons (think...Terminators) and the Tau (um...not sure a good description here...Anime Space Hippies).
Very good RTS, interesting concepts and I'm looking forward to the changes that the new expansion will bring, as they're adding things like map-driven campaigns and a few other new features that would normally be reserved for a new version of a game and not an expansion.
More info at:
http://www.dawnofwargame.com
and
http://www.dow-darkcrusade.com/main.php?region=US
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You just keep on trying till you run out of cake"