Alien Arena: Tactical is a new game-play mode that is objective-oriented and facilitates teamwork. The full release of Alien: Arena Tactical is expected in Q2'2014 while for now this alpha bundle is part of the updated Alien Arena: Combat Edition release.
More information on this new Alien Arena game with a Linux client was talked about last month. Embedded below is a video trailer of the Tactical demo. This latest open-source game release can be downloaded at PlanetArena.org.