Not even two full days have passed since Treyarch and Activision's launch of Call of Duty: Black Ops 4 and players have already found ways to put the game's emotes to the kind of use they weren't really intended to - peeking around corners.
In order to make Call of Duty: Black Ops 4's emotes stand out, Treyarch made sure that the camera backs out quite the distance behind the players model. In hindsight though, too much focus on making them matter brought about too little focus on what else the camera shows once it's back there.
Reddit user sw3ar posted his video two days ago, showing the exploit in action in Call of Duty: Black Ops 4's Blackout mode. In his case, he stood behind a tree, which gave him an scarily good view at his surroundings, in a very Fortnite-ish manner if I may add.
Treyarch are aware of the issue and have responded to the video, linking to the list of things they've addressed and are yet to fix, with emote peeking being among the latter. Apparently, the fix will come in the form of two gesture systems, or more precisely - two camera systems for them.
According to the company, a fix is being worked on wherein Call of Duty's emotes will rely on a competitive camera view, i.e. one that "disables free look and applies different camera settings to prevent using to see around corners". This will be the case in in all modes that require a more restrictive camera system.
As for the standard emote behaviour, it will be available in the zones where it won't hinder balance, which pretty much means just the staging area. Treyarch insist that they always planned for players having fun with Call of Duty: Black Ops 4's emotes, or gestures, whatever, but not at the expense of fair gameplay.
Treyarch's post also mentions sub-optimal spawning in Domination and razor wires triggering team kill detection in Hardcore modes, as well as a bunch of changes applied so far to Call of Duty: Black Ops 4.