AirBuccaneers was released on December 5th and you can purchase it from Steam. You can also test the game before hand by downloading the Demo version from this page. The Demo version has some limitations compared to the full version.
NOTICE: The game automatically creates you a Guest Account which you can then register in the Settings menu. You should register your Guest Account within 5 days from starting to play the game. Premium Account has following benefits compared to Guest Account: No rank level limit, Character customization, Character development with Perks & Flaws, Access to Kamikaze ship, Access to Taunts, Can pull rank on lower level and non-premium account players on ship helm.
[Downloads WebInstaller for Windows. Coming to Mac and Linux.]
[Download Windows ZIP package from here]
System Requirements can be found in the FAQ