The news that Call of Duty: Warzone will begin integrating with Call of Duty: Black Ops - Cold War in December raised a fairly obvious question. Will Warzone still feel like Warzone, or will it shift over to the new Black Ops–Cold War paradigm?
This isn't as simple a question as it appears, because most modern Call of Duty games are built on a variant of the Infinity Ward engine. Modern Warfare and Warzone were built using IW 8.0, whereas Treyarch's Black Ops - Cold War was developed using what Activision imaginatively calls the Black Ops - Cold War engine. The latter is a custom engine originally based on IW 3.0 which has been developed alongside the Black Ops series (and incorporates elements of IW 8.0).
Point is that the differences between these pathways may appear slight, but the different software architectures underpinning the games leads to them feeling different in the hands. There's no need for concern about Warzone's style changing, however. In response to some user queries on Resetera about a possible engine shift, user Shuttermunster, verified as an Activision art lead, responded by saying: "There will not be an engine shift for WZ."
It probably seems head-slappingly obvious that Warzone wouldn't be rebuilt to this degree, so soon anyway, but now we know. So Warzone is still gonna feel like Warzone, with the only big question now being how smoothly the Black Ops - Cold War equipment will integrate with the experience.