Cameron Waldrop
The announcement has this lore give regarding the changes:
You can expect the Stronghold changes to entirely revamp that location on the map, with the changes being given as:
Players can expect new modes to accompany these massive Warzone changes, with Rebirth Resurgence Solos adding in the same respawn-enabled deathmatch mode with a solo twist. Rebirth Payload will have players undertaking the usual escort/attack game mode with a 12v12 lobby. Rebirth Blood Money works like previous mode Plunder, except it no longer matters how much money your targets have on them, you’ll still be getting paid.
While those are some major changes to Warzone, Vanguard players aren’t ignored and will be getting a new 12v12 mode called Arms Race.
You can see all the changes coming in this infographic:
The changes to Vanguard will be coming in an update on March 22 at 9AM ET. Warzone will be getting the season 2 Reloaded update a day later at 9AM ET on March 23.