The venerable creator of the Age of Empire series learned of its fate in September last year, when Microsoft announced it would be closing the internal development studio to shave costs, or as Microsoft put it, to "keep [Microsoft Game Studios] on its growth path."
Ensemble was founded in 1995; Microsoft acquired the studio in 2001.
Halo Wars is a real-time strategy game made for Xbox 360. Ensemble, which made its name as a purveyor of PC strategy games, hopes to have overcome the limitations of the console controller.
The game will be available February 26 in Asia, 27 in Europe and March 3 in the Americas. A demo will launch on Xbox Live on February 5.