https://www.pcgamer.com/call-of-duty-black-ops-4-pc-trailer-shows-off-4k-graphics-and-uncapped-framerates/

Call of Duty: Black Ops 4 is "optimized for the PC," says Activision, and in case there's any doubt, here's a new PC-specific trailer showing it off. 

The PC version of Black Ops 4 will support ultrawide and multi-monitor setups, with 4K resolutions and uncapped framerates. Players can take advantage of "extensive control customizations," and "gameplay and gunplay [are] balanced for the PC experience." What exactly that means isn't actually clear, but trailer makes reference to mouse and keyboard support, and that's definitely a plus in an FPS series we've always played with mouse and keyboard.