Modders find new weapons, vehicles and gametypes in the Halo 3 beta code!

A group of modders recently got in to the Halo 3 beta code and have noticed a few things burried in the code that is not in the beta.  This group claims to have stumbled accross new gametypes, weapons and vehicles that Bungie has said nothing about (yet).

Now what I am about to post is from a modding community forum that was recently posted on Gamesradar.com.  Also, none of these new weapons, vehicles and gametypes have not been confirmed either but knowing how secretive Bungie operates, it is very likely that there is going to be a shit load of things about Halo 3 that no one knows about.  Remember how tight lipped Bungie was about the Arbiter being a playable character in Halo 2? no one knew about that until the game was released.

New equipment:
Instacover
Smoke (suggested this might be a smoke grenade?)
Jammer

New vehicles:
Chopper
Pelican
Shadow

New weapons:
Flamethrower
Claymore Grenade

New mode:
Infection (described as "Destroy the Flood or become infected. Score points for killing flood or big points for infecting a human. The player with the most points wins."

New rankings:
The highest rankings are now Killpocalypse and Killionaire, instead of Double Kill and Triple Kill.

A reference to a map editor has also been found, a returning feature from Halo 2.

The information has since been removed from the forum in question.