On Xbox Live Arcade, there aren’t very many free games other than Hexic HD (which comes with the Premium version of the console). Well, this Wednesday, Microsoft will be releasing a game called Aegis Wing (for free), which was created by a trio of student interns at Microsoft. The game was left unfinished when the interns left to go back to school after summer, so it was then finished by Carbonated Games (they made Hexic).
Aegis Wing is a space shooter game, where players are able to work together and they could fuse their space ships to fight against the aliens. Check out the game when it appears, it should be a good one.