This thread will bring together knowledge through press releases and exclusive hands-on demos provided to games websites and magazine reviewers of the weapons and vehicles seen or known to be included in the release. Please take this list with a pinch of salt; Epic has not confirmed the final list as yet.
Vehicles will be notably different between the races. Humans will use the vehicles supplied by the Axon corporation, which are basically the vehicles from UT2004, whereas the Necris will bring in vehicles similar to ours in strategic function, but will differ in appearance and handling. From the descriptions given they have a very Warhammer 40K Chaos Marines feel to them!
Weapons: KEY:
Confrimed,
Most Probable,
Marginal/Vague,
Rumour
BioRifle
Link Gun
Stinger
Flak Cannon
Rocket Launcher
SMG (Primary: Rapid fire of plasma slugs; Secondary: Solid molten plasma stream) (Gamespy)
Shotgun (secondary fire launches grenades) (Gamespy)
Railgun (Description given by Gamespy sounds more like the shock rifle) (Gamespy)
Chaingun (Gamespy may be referring to the reappearance of the Minigun) (Gamespy)
Vechicles: KEY:
Axon (Izanaghi Corporation (Humans)),
Necris
Manta - Described as a "hoverbike"
Hellbender - Described as an "All-wheel drive transport (perhaps much like the UT2004 incarnation)
Goliath - A heavier version of the UT2004 incarnation
Viper - Described as a "hoverbike"
Nemesis - A tank with three distinct modes, altering tank altitude. The higher the tank, the faster the move/fire rate, but the easier it is to hit.
Dark Walker - Think War of the Worlds Tripods and it pretty much sums it up. Three long tentacle-like legs and a big laser!!!
You can contribute to these reference threads in the provided "feedback" threads (for this one it will be "HUTP: Armoury member contribution"). This is mainly to keep track of information sources and to keep this page as close to truth as is possible at this stage of develpment. Once your contribution is confirmed I'll add it to this post ASAP

thanks
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Sources:
Gamespot
IGN
Gamespy
Unreal Tournament III Offical Site