Swedish magazine level has had the chance to play halo 3 in multiplayer and there are 3 levels which is revealed,
Valhalla = blood gulch, High Ground = Zanzibar, Snowbound = Frost bite.
New vehicle - Mongoose, mostly for transport 2 persons.
new weapon- spartan laser, hard to use but extremely powerful vehicle destroyer apparentley
- nail grenade, sticks on walls and emits nails into the air.
new weapon - spiker (brute weapon),
your secondary weapon is visible at all times at your back.
New transportation system in multiplayer- man cannon, launches you into the air through air streams, you can still be fired at and you can fire back.
The X-button will have a special use which Bungie will not reveal.
No bots will come to H3. that will be all.