You pre order the game
Yes and No.... For now, the only reveal of "weapon customization" was skins. 343 has confirmed it, but no details released.
You cant dude...this is not COD
select it as a weapon in your loadout editor
it is a halo weapon used in the games halo 3
With a weapon in Halo 3
both
Dying
There are HUD skins and weapon skins that can all be found at gamebanana.com
Weapon skins, and a patch
Yes. The sentinal beam is a weapon.
The Plasma Pistol
halo in the game or film is a alien weapon that has an ability to destroy galexies