Gears of War: Judgment introduced a few new multiplayer modes, and cut a few others. But one of the modes left on the cutting room floor is actually still lurking on the disc, and can be accessed through some complex menu selection voodoo.
If you just can't wait that long or simply want to see it for yourself, you can access Warzone by choosing a Private Match, then Team Death Match, and pressing A. When the next prompt appears, you simply press A and B simultaneously, and then press A again to continue.
Steve Watts posted a new article, Gears of War: Judgment 'Warzone' mode found playable on disc.
Gears of War: Judgment has a bit of leftover code on the disc from prior Gears games, letting users access the Warzone multiplayer mode.