The offiical release date for all of you living in North America is August 2nd, while internationally you are looking at the 10th. This game while not quite my cup of tea, looks like a fun one to just sit down with and blow some stuff up. Here is what I could find of the offical announcement:
THQ has today announced the release date for Warhammer 40,000: Kill Team, the downloadable title recently launch on Xbox 360 via Xbox LIVE Arcade, for PlayStation 3. Having benefited from significant critical acclaim on Xbox 360, the PlayStation 3 version is sure to be met with great anticipation from fans of the Warhammer 40,000 universe.
A thanks to Hotpanda of The Chaos Manifesto for the heads up here.