User blog comment:Deathmanstratos/Annihilation released for Xbox 360/@comment-1039177-20110629013537

Not sure if this is real, but just for the sake of entertainment, a recently posted article about a FOURTH map pack being released in September.

Says the four multiplayer maps are Mansion, Cargo, Metro, and Harbor, along with yet another zombie map, Quarantine.

Unconfirmed Sauce: http://thegamershub.net/2011/06/call-of-duty-black-ops-retaliation-map-pack-due-in-september%E2%80%93details-leaked/