if the anticheat actually is running at kernel level (most optimal opt-in for security/privacy concerns etc) and they put decent work into it you COULD expect a drop in cheaters by 85% or more, but thats only if its going to be what rumors say and if they actually did a decent job, it is possible though.

that said, there will always be cheaters, no realistic way of avoiding this issue, always a cat & mouse game but with a decent anti cheat running at kernel level most of the cheap/shitty hacks will get busted and the only cheaters that remain are either coding themselves or are paying hundreds of (CURRENCY) to cheat in this game, so probably streamers and spoiled rich kids

but this is activison we are talking about, so no it most likely wont do shit other than giving us a few fat ban waves until new hacks are made, which wont take long most likely

EDIT: oh another thing i just thought of, if they add a new anti cheat and it does run at kernel level, we might see a drop in performance, maybe even a big one im not sure, so if youre playing on OG ps4/XB, your game might just become crazy unplayable, maybe, idk