The prices shouldn't be too bad for a 360 when Halo 3 comes out. They'll be considerably less than they are right now, at least.
I'm excited. The weapon the Master Chief is holding is the M-A5B Assault Rifle from Halo: Combat Evolved. I hope they keep it, and even keep it along with the battle rifle.
I'm hoping they completely get rid of the energy sword in multiplayer variants (thank you, Team/Rumble Hardcore!), and hopefully stick solely to the Master Chief storyline instead of us having to play as the Arbiter (that covenant guy. you can tell I'm not huge on the campaign aspect of the game). Although, I hope they deliver on their promise to improve the CPU AI in the campaign. Highly anticipating this one.
The only reason the energy sword was so overpowered in multiplayer was because they made it with an infinite supply of energy for no real reason. It depleted in the campaign, which is what it should've done in multiplayer. I'm hoping they have all the weapons from the Halo universe in the game, including my personal favorite: Lotus anti-tank mines.
I'm not a big Halo fan but this looks pretty awesome, even though I never really like playing those Sci-fi games...
NO Also for those of you that don't know the entire trailer was rendered in real time off a 360 dev kit. After microsofts E3 conference some of the guys from bungie showed off the trailer and where moving master chiefs around and flying the camera around the map.