Gamespot have posted a new story with their Hands-On impression of the upcoming game MechAssault. Here is part of the story:

Microsoft made a strong showing of PC games at GenCon, but the company also had a separate Xbox kiosk with a running version of MechAssault, its upcoming Xbox mech combat game, on the other side of the hall. The version on display is newer than the one we saw at E3, and had several more levels implemented. We were able to jump into a quick game in an outdoor hangar level. MechAssault's control scheme will be much simpler than the MechWarrior keyboard-and-mouse control setup on the PC, though the controls seemed slightly modified from E3. Similar to Halo, the left analog stick is used to move your mech, while the right is used to rotate the camera. Mechs with jumpjets can hop or fly by pressing in the left stick. The left trigger button is used to cycle through weapons, while the right trigger is used to fire.

Mechs will have a variety of futuristic weapons, including laser and beam attacks, electric blasts, and homing missiles that can track enemies once you've successfully locked onto them by hovering your targeting reticle over them for a few moments. Mechs in MechAssault move much more quickly than they do in the classic PC MechWarrior series, and they have to, since they'll have to deal with smaller, faster enemy mechs, as well as smaller vehicles, like combat tanks, and scattered infantry units--the latter, as we saw, can be dispatched by firing on them or simply squashing them by running over them with your mech.