Here is the reveal for Black Ops 2, which I am sure most have seen now. It shows CoD effectively going into the future with its weapons.
Personally I am unsure about what to expect from BO2, though I am steady player. However, after seeing the following "documentary" you can dial me up a bit more excited that they are really going for near future weapons/gadget rather than pure sci-fi which would have been jumping the shark for me.
Documentary - Official Call of Duty Black Ops 2 - YouTube