The "Combustible Map Pack" contains three new maps and the pack is priced at 800 MS points. 'Flood', 'Gold Rush' and 'Fuel Station' are Epic's latest multiplayer offerings.
"Flood features a rising flow of Imulsion that drives the fight into close quarters. Infiltrate an Imulsion factory in Gold Rush, where multiple levels and volatile materials guarantee memorable encounters. Fuel Station delivers a dangerous battle around an abandoned refueling facility," Microsoft on the Xbox LIVE Marketplace.