DEFCON Distributed by SteamFrom IGN:
Valve and Introversion today announced an agreement to deliver Defcon, a new online strategy game from the creators of Darwinia. Defcon, Introversion's third title, will be released in September 2006 via Steam and at retail outlets for $14.95.
I believe, without question, that is going to be the surprise, smash hit of the fall. These guys just flat-out know how to make games.
September. That's not very long to wait.