The Aliens vs. Predator Swarm Map Pack is set to hit PS3s, 360s, and PCs on March 18 for $7.00 or 560 Microsoft Points according to the Sega Europe Blog and a followup with the North American branch.

The pack opens up four new maps to the public that were previously only available in the European special edition of AVP. Here's the description straight from Sega:

Two new Multiplayer maps for six different online modes (Deathmatch, Predator Hunt, Infestation, Species Deathmatch, Mixed Species Deathmatch and Domination) :

• Docks: The caustic alkali waters of BG-386 put an end to Weyland-Yutani’s planned shipping activities.

• Machine: As well as processing exotic ores, the BG-386 Refinery provided electrical power to the colonists at Freya’s Prospect.

Two new Survivor maps in which up to four Marines battle to stay alive against increasing swarms of Aliens