Microsoft and Ensemble Studios have sent out information regarding the upcoming demo for Ensemble's last game - Halo Wars. The full game that just went "gold" is due out on February 27 (Europe) and March 3 (North America).
"In the demo, players will be able master Ensemble's groundbreaking control scheme in optional beginner and advanced tutorials or jump right into the action to experience the beginning of the "Halo Wars" story with the first two campaign missions. The demo will also include "Chasms," one of "Halo Wars'" 14 multiplayer maps, wherein players can battle it out in Skirmish mode vs. A.I., playing either as the UNSC with Captain Cutter's leader powers, or as the Covenant with the Prophet of Regret's own unique abilities."
The screens below are from the demo.