We've talked about this here at E3 so I expect it will come out in the press coverage over the next couple of days. For Warzone we have two different variants planned:
1. The core mode, which is focused on the combination of 12v12 player-versus-player action, base capture and AI-controlled combatants (including bosses). This is what we are demoing and is playable here on the E3 show floor.
2. A Base Assault attack/defend scenario in which one team is attempting to defend each base on a map and the other is pressing to capture the base and push them back in timed phases. The defenders are attempting to hold the base until time runs out. As the attackers manage to capture each base, they force the defenders back and extend time until they are assaulting the Home Base of the defending team and trying to destroy their core. This variant focuses solely on PvP without AI adversaries.
The mode plays differently depending on the variant. In addition, we are working on a more classic BTB experience with timed weapon and vehicle spawns, and this will be introduced shortly after launch with a number of maps specifically optimized for BTB.