ice on 28 September 2015
Arena
Videos
Previews
VentureBeat - http://venturebeat.com/2015/09/25/arena-mode-multiplayer-could-turn-halo-5-guardians-into-an-esport-hands-on-preview/
Gamespot - http://www.gamespot.com/videos/new-spartan-abilities-in-arena-halo-5-guardians/2300-6427245/