The Warzone Season 5 teaser hints at 5-man squads or at least the community believe it to be true. Back in June, Infinity Ward teased 200 man lobbies, which the fanbase was ecstatic over. Warzone has quickly risen to the top and only competes with Fortnite when it comes to the total player base and adding the chance of a 200-man lobby cements their legacy.
Warzone Season 5 Teaser Hints at 5-Man Squads
Investigators on Reddit slowed down the trailer and in the first second, took a screenshot of the helicopter landing on the Stadium. As you can see, there are five bodies in the helicopter instead of the usual four. Even though that's not a lot to go on, Infinity Ward is bringing 200-man lobbies which gives plenty of room for expanding squad size.
Despite the evidence and the high probability of this happening, it's not guaranteed. There could even be a chance of it becoming a certain playlist or a tested game mode that could be brought back after some testing.