It was confirmed on May 1st with the World Premiere, that Call of Duty: Black Ops 2 is coming. A 2-minute trailer was played during the NBA playoffs on TNT. This trailer answered our prayers and placed an end to all rumors. Little information about what we will see in the next game. A couple things that we can expect are, there are zombies, multiplayer mode might have more players, bigger maps, and a futuristic setting. Black Ops 2 is going further into the future with a more modern version of warfare. The game is going to take place in a slightly distant future, but still have some of the characters we saw in the previous Black Ops. It will be interesting to see how fans react to the futuristic gameplay after the game is released in November.
Treyarch is the developer as expected. They developed the first Black Ops and it's no surprised they went to work on a sequel. Zombies will be in this forthcoming release and we might see some prior maps ported over.
You can read more about Black Ops 2 here.