Word of the game leaked out with a preview in the latest issue of PC Gamer, earlier than Tripwire anticipated. The studio promises a proper PR effort will soon begin in earnest.
All Tripwire officially states for now is that it has been developing Heroes of Stalingrad for three years, and that the game is built upon Epic Games's Unreal 3 engine.
We would wager that this latest in the World War 2 tactical shooter series will be released on at least the PC, and that the Soviet city of Stalingrad is involved somehow.
Also, unless Tripwire has changed their minds between Killing Floor and now, it'll use Steamworks DRM and have achievements and your Steam user name will be your in-game username. Awesome.