CVG has word that the Halo 3 Beta is coming May 16th
. "The beta will run through to June 7 at 7:59am - giving you just under a month to tone your Halo 3 fragging skills. Three maps will be available for you to stomp around in your 360 Spartan armour; Snowbound, High Ground and Valhalla ... New guns and vehicles available for sampling include the nippy Mongoose all-terrain vehicles, Brute Spiker, Spike Grenade, all-new Assault Rifle and Warthog-smashing Spartan Laser."
They also point out the functionality behind the much-talked about X button
: "The secret function of the little blue button is for deploying equipment and you see three different kinds in action in the latest video documentary. While the developer doesn't specify exactly which pieces of equipment are exposed in the video, we're guessing that the new bubble shield, trip mine and mobile gravity lift are all assigned to the fancy new X button functionality."