Does it really count as a "release date" if it is the day after you announce it?
Red Orchestra started out as a modification for Unreal Tournament 2004. From there, the team won the first Make Something Unreal where they were granted a license to use Unreal Engine commercially. They grew, as a company, to not only develop multiple titles but also publish a few.
Rising Storm is based in the World War II Pacific Theater. Four factions are playable: two American and two Japanese; each country has an army faction and a naval infantry faction. Multiplayer gameplay, note that single-player will arrive at some point beyond launch, is based on a balance of imbalances. Managing the perception of inequality is a difficult task for a developer to take, but also provides a broader experience for players; expect a storm to rise in the official forums.
Rising Storm will be available at some point in the early afternoon of May 30th, 2013 (US Eastern Timezone). The base game will be available on Steam for $19.99 USD, or $29.99 USD for the digital deluxe; for the next handful of hours, you will still be able to pre-order for a 15% discount ($16.99 and $25.49 respectively).