"Halo Wars" is the next big real-time strategy game from Ensemble Studios, creators of Age of Empires. Designed exclusively for the Xbox 360, "Halo Wars" allows you to take charge of the human UNSC armies and see the Halo universe from a totally new perspective. However, we might get a taste of the game sooner than we expected.
Updates:
No demo, only a video demonstration.
http://www.computerandvideogames.com/article.php?id=170860
