The Last Stand is upcoming multiplayer mode for Warhammer 40k: Dawn of War II that will be a free download for players of the strategy title.
GameSpy got a hands-on preview, and the site says that two players will be controlling Heroes fighting off waves of enemies.
There is loads more than that through the link, along with a couple nice screens for it.
No word on when it can be expected, but word has it that it may be sometime in October.
Relic will be showing the new mode off at PAX 2009 next weekend, so hopefully we will know more then.
Eurogamer France a video of it. You should watch it.