Details on Black Ops 2 Matchmaking, Security, Servers, and Mod Tools
The post explained that the dev team has its own proprietary server-side anti-cheat technology that will work alongside VAC, and an improved player reporting system. Further, a full-time dedicated PC anti-cheat team will be working as of release to detect and ban cheaters.
Black Ops 2 will have both Matchmaking and Dedicated Servers, allowing players to get into Public Matches or League Play via matchmaking lobbies.
The post also confirmed that Black Ops 2 will neither feature mod tools, nor the ability to rent a server.