Microsoft kicked off its 2015 E3 presentation with the announcement of "Warzone," the multiplayer mode for Halo 5: Guardians. Billed as a multiplayer experience more ambitious than anything ever introduced for Halo, "Warzone" is a 24-player multiplayer mode that features maps four times larger than previous Halo games, along with AI-controlled adversaries. Also look for seamless drop-in/drop-out co-operative play, and the ability for downed teammates to be revived in co-op. Single and multiplayer modes both run at 60 fps, with an engine built for Xbox One. Look for "Warzone" to launch October 27th.