Halo 5: Guardians has been out for a couple of weeks for the Xbox One, but Microsoft and 343 Industries are gearing up to launch some free content for the first person shooter later in November. The first free update is called Battle of Shadow and Light, and it's biggest addition is the Big Team Battle vehicular-themed multiplayer mode.
"Next week, the new 8v8 Big Team Battle playlist will become available. Grab a group of friends, jump in a Warthog, and duke it out on four new Big Team Battle canvases: Deadlock, Basin, Guillotine, and Recurve. Looking for explosive, large-scale Arena action? You've found it."
That's not the only thing that will be included in the Battle of Shadow and Light update:
"There are tons of new REQs added to this month's drop, including ones that might give you access to the Ultra Rare Shinobi armor and Legendary Dying Star Light Rifle (to name but two). We have Tundra and Woodland-themed vehicle skins, a brutal (and occasionally hilarious) Shove It assassination and dozens more items to unlock, discover and utilize."
Source: Halo Waypoint