At Halo Fest 2014 they revealed gameplay for Halo 5: Guardians Multiplayer Beta! The Halo 5 Beta will be available to those who pick up a copy of Halo: The Master Chief Collection and will run from Dec. 29, 2014 through Jan. 18, 2015.
Here’s a Halo 5: Guardians Multilayer Beta ViDoc they aired
Halo 5: Guardians Multiplayer Beta Gameplay
Slayer on the map Truth, the remastered Midship for Halo 5: Guardians
Slayer on the map Empire
Breakdown on the map Crossfire. Breakout is new gametype where 2 teams play best of 9 rounds where you have 1 life – first to 5 rounds wins