GameSpy has a preview of Unreal Tournament 2004 for you all today, along with this interview with CliffyB. Here's a bit on the vehicles that Epic is adding to the game (there's going to be a rebate for UT2K3 owners wanting to pick up the new game when it is released later this year)

Cliffy B: If I listed every last vehicle, then there'd be nothing to look forward to! We just got in the updated three-person Hellbender. (It needed a makeover, the first design was too similar to another huge franchise's buggy that everyone knows and loves.) It now looks like a Humvee on crack/steroid cocktail with both passengers manning their own weaponry. Vehicles are a lot of fun, but they can change a game dynamic significantly, and it requires a bit of finessing to keep things fun and balanced. We don't want the gamer to feel useless if he doesn't have a tank, so balancing each vehicle's strengths and weakness is an ongoing challenge (especially when you insert vehicles into a game dynamic that already has 12 or so established and well-balanced weapons).