Activision's Heavy Gear II site has got the editing tools for this new game of giant robot combat on this page, which says you'll be able to create multiplayer maps, (Deathmatch, Capture-the-Flag, Strategic, Duelist, and Steal-the-Beacon), "Historical" (Single-player) maps, terrain environments, and zero-gravity space environments. Thanks Tim from 3Dfiles.com.

They also have Bonus Multiplayer Map #1 for Heavy Gear II in the Downloads section, along with this description:

Bitter rivalries have been going on for ages between Erech and Nineveh, two city-states on Terra Nova. Most concern the rich oil caches found under the local terrain. For the past several months Erech has had a price war with Nineveh. Now tensions are running high. It was inevitable that a fight would break out.