The second installment of Red Orchestra by studio Tripwire Interactive is about to be released on STEAM (Sept. 13th/11). The first one was amazing (I've often referred to it as the "Flashpoint / ARMA" of the WWII FPS genre) a more realism-focused shooter for those tired of running around with the twitch-kiddies in games like COD etc.
Follow the "external link" at the top to a thread on the Tripwire forums that explains pretty much everything there is to know about RO 2.
the offical website is www.heroesofstalingrad.com
Can't wait for the second one.......it's going to be great. If you like WWII FPS at all do yourself and a great DEV a favour and pick this one up!