During a livestream event at Gamescom today, Treyarch outlined Arena, the ranked online play feature in the upcoming Call of Duty: Black Ops III. Arena replaces League Play found in Black Ops II.
Experience the most dramatic evolution in Halo multiplayer. Challenge friends and rivals in new multiplayer modes: Warzone, massive 24-player battles, and Arena, pure 4-vs-4 competitive combat.
Halo 5: Guardians' Warzone and Arena were spotlighted in the new trailer Microsoft released for the game during their Gamescom press conference. The trailer is just over a minute long and features a lot of hard-hitting multiplayer action. You can check it out below from the official Xbox channel.