Microsoft's conference was great but I think the thing that I liked the most was the Halo 3: ODST presentation. They showed us the opening cut-scene and gameplay footage, and gave us more info on the game.
This Halo game will be a little different from past games because you will be playing as many different Orbital Drop Shock Troopers (sorry Master Chief Fans) via flashbacks to put together the pieces of the story. Luckily the ODSTs have access to special gear that Spartans don't such as 2 new sound suppressed weapons: one of which is a pistol with a zoom feature and a new visor, a low light vision mode. All in all I think this game is shaping up pretty nicely.
Now are you ready to hear even more news? Those who buy Halo 3:ODST will be invited to the multiplayer beta for Halo: Reach.
Update: Halo 3 ODST to include exclusive wireless Xbox 360 controller. It’s going to cost you $99 when Halo 3 ODST drops on September 22, but don’t worry that includes the game as well.
Update 2: There is a new Firefight Mode in ODST which is much like Horde mode in Gears of War 2 or Zombie mode in Call of Duty: World at War. You can have up to 4 players playing cooperatively (each taking one of the 4 ODST soldiers that are playable in Campaign). There are only a set number of lives that the entire team shares.
Update 3: "Preorder the game through select retailers and a fifth ODST soldier, Sgt. Johnson, will be added to the list of selectable characters." - IGN