Pretty much what it says on the tin. I just bought an MX Master 3S and got excited over the idea of being able to bind zoom in and out onto the thumb wheel. Would make adjusting scopes and cameras effortless, or some other action.
Now I'm no game developer, but what are some of the largest things file size-wise that got added? Because the update is worth of another 8-15 custom maps in size. I'm just wondering what warrants a 7+ GB update? What did they do?