A free Gears of War 3 Booster Map Pack add-on has been released on Xbox Live Marketplace.
It adds five maps for public Versus play. Two of those maps - Bulletmarsh and Clocktower - are new.
The other three - Azura, Blood Drive and Rustlung - are from the Horde Command Pack DLC, and were previously only available in private matches.
The Booster Map Pack add-on is 237.67MB.