If you don't feel like shedding out the dough just yet, wait until 3rd September, 2007, after which the map pack will be free to download. Here are a few details about the pack:
Get ready to enhance your Gears of War multiplayer experience. Download the four new maps today, including:
Bullet Marsh: In this Kryll-infested swamp, an old generator still powers the area lights. A few stray bullets could easily knock out the generator, leaving players in the dark to fend for themselves against the hungry Kryll.
Garden: This overgrown and crumbling conservatory still has a working fertilization and pesticide system. This system can pose a serious health hazard to anyone who ventures into the greenhouse without first venting the air.
Process: Teams must fight for control of this subterranean Imulsion processing plant, still active despite the cessation of the Pendulum Wars.
Subway: Timgad’s Central Subway Station used to serve as a central hub for commuters. Now the tunnels are crawling with Locust.
dude if you are in the dark just keep you chainsaw runnign and you git close to one of the you will kill them all 
