Call of Duty Black Ops 2 & Treyarch creative design director David Vonderhaar said in reply to a question about new game modes posted on Reddit that the studio was working on additional game modes stating:
"Absolutely. Although we haven't released any details, or even decided which ones, nor could I give you a count or time, we have several games modes we play in development."
No further details or timing were provided but additional content such as this will most likely appear in DLC packs that are in the works. While additional game modes for Black Ops 2 is exciting for many, there are quite a few people who would be content to play the existing game modes.