The official twitter page of Halo 5: Guardians announced that the beta would begin today. Those who purchased the Halo: Master Chief Collection now have access to the beta. Those who wish to get into the beta, can order Halo: The Master Chief Collection
using the link. The multiplayer trailer can be viewed below for those who haven't seen it yet.
This is a multiplayer beta that everyone should get their hands on. 343 Industries have taken their time to improve the Halo franchise after many fans didn't take to Halo 4. This is where 343 Industries have gotten it right. With New upgrades and abilities gives players more to toy with to destroy, evade and outmaneuver their counterparts.