Halo 3: ODST was announced a while ago however it now has it's own Project page and an awesome gameplay trailer on Bungie, and they also today announced Halo: Reach, a prequel to the trilogy, that the trailer doesn't give much hints about... but they both look so epic! Differences I noticed in gameplay of the ODST trailer: Grenade count and ammo count have been moved to the bottom of the screen, and a compass has been added to the top. You can now hold up to 3 of every grenade type. The SMG has scope and more range. The pistol has scope. There will also be a downloadable multiplayer demo for Halo: Reach available to anyone who buys Halo 3: ODST. Your thoughts?