The campaign will be a controversy, and if Youtubers are to be believed, it will dwarf No Russian. As someone who looks forward to CoD campaigns, this interests me a lot.
That said, BO4 has soured me from buying more CoD games. But it is a different team managing it, and what I've seen so far seems to be really promising, especially the gun customization. I feel as though for CoD games these days, a maturing period of maybe 3-4 months is needed to really decide if its worth a purchase. Usually by this time, the community would have a better feel for how the game is going to be supported, and enough time to see if the microstransaction bullshit will rear its head finally.