To clarify information about the game since the original poster hasn't paid attention to what bungie has said.
1)This game is being done by a very small team at Bungie. They wanted to do one more Halo project for the fans. The next complete halo is being done by the new Halo Team at MGS
2)ODST is not squad based like Ghost Recon. Still a FPS, just need to play it a bit different as your not a super spartan
3)Game won't be full price







