I'm actually hoping that they are, in favor of bringing back and expanding on Firefight and BTB.why cant they have a PvP mode (arena) and big PvP mode BTB a PvE Mode (firefight) and a PvPvE mode (warzone)... that is essentially what they have in the game now, but with the dev time they have they could expand greatly on all of those (although i would argue arena is in a good place already)
Ideally, that 12v12 player count would be used to bring back Invasion, but that's probably unlikely.
I'm not opposed to a PvPvE mode, just the Warzone format.
I outlined an idea for a revamped Firefight mode in this thread
which would focus much more on the survival aspect of the game, emphasising teamwork and player choice through the sandbox, but this gamemode with its large maps and varying objectives also lends itself to a PvPvE mode.
Firefight Vs would put opposing teams of Spartans (and Elites) against each other in the same way Warzone would, but at a smaller, more manageable scale (4v4). You could even incorporate elements of Dominion with turrets and resupply drops.
My point is that when you pit a large number of players against AI, said AI needs to be scaled against that, and this is why you end up with 8 players in REQ variants of vehicles all spamming away at one or two bosses with massive pools of health. It's not fun, imo.
The 24 player count would be much better utilised in Invasion, where the focus is solely PvP, because other players will usually present a more dynamic challenge than AI. This would also benefit BTB because we'd be getting developer made maps again, rather than just Forge variants.