1. The Halo community on Xbox is HUGE, PS3 cannot hope to compete in anyway.
2. Halo is based on communication and callouts, as any of you who play GB will know, which is where the PS3's "lovely" Bluetooth mics will "definately" come into play.
3. It will not sell, PS3 is a bunch of COD fanboys trying to compete with the Xbox ladders.
personally i am excited and not at same time. im not because i already got halo on xbox 360. i am because ps3 is expanding!!! and because bungie will probably make more money from this.