This game was apparently actually supposed to come out after MW2019 rather than cold war, but they ran into some massive issue, and it was apparently easier to push Cold War out the door when it was like 80% done and had a year cut off its development.
So on the plus side, Vanguard will apparently launch with 20 multiplayer maps, which is like 3x the number of maps Cold War launched with because it got an extra year of dev.
Also, the pacific theater might actually be pretty interesting as one of the main characters is an Australian soldier, so we'll actually get some of the Australian perspective this time around. I'm also excited to see some of the African conflict.
Honestly though, I've never been very into the Slegehammer COD games.
Also, about Warzone integration, yeah, I hate it. I don't care for Battle Royales at all, and having to download patches for WZ for MW when I had no interest in playing it was brutal on the PS4. Thankfully on PC you don't have to install Warzone or care about the updates for it. Makes the game so much smaller.