For those who purchase Call of Duty: Black Ops II for the PC, Treyarch developer "PCDEV" announced that the FOV slider for the PC version of the game will be limited to 80 degrees, just like in Treyarch's previous game. Announcing over Twitter (since I can't provide the physical tweet), he said “And don't ask me to raise the FOV cap. Max is 80. Thankyouverymuch. <3, -pcdev.”
A Field of View cap is essentially a limit to how wide the field of view will be in a game. Normally, this is limited to anywhere between 60 or 65 degrees on consoles due to their limited processing capabilities and the distance players sit from their TV. The higher the FOV, the more textures need to be rendered and given that the consoles have a severe limitation of sheer graphical power on consoles, it's one of the best ways to squeeze performance out of consoles. (Similar to making guns bigger so the game renders less of the screen.)
PCDEV also announced that ranked play in Black Ops 2 will be limited to 200FPS, though for anyone using a monitor with a 120Hz refresh rate or lower then this shouldn't be a problem.