Cesar Stastny of Treyarch, aka pcdev, has been teasing gamers on Twitter about the improvements the PC version of the game is getting. Since the PC version is being developed by a dedicated team, the game engine is getting significant improvements and also extra graphics options.
pcdev: "Confirmed: #BlackOps2 engine has significant performance improvement for PC"
pcdev: "PC will get some extra graphics options if you choose to dial up the visuals."
The PC version will also be getting lean, unlike the console versions; FOV (field of view) will also be adjustable from the options menu.
pcdev: "Confirmed: Lean and Adjustable FOV in MP #BlackOps2"