The Black Ops II Security and Enforcement policy which details offenses, and their consequences has been released on the Black Ops II community forum. The bans are either temporary ranging from 48 hours to two weeks or in case of an extreme offense, permanent.
Modding and hacking or using pirated content would get players permanently banned right away while minor offense would result in a temporary ban.
Minor offenses include using unsupported peripheral devices and applications, boosting stats by exploiting the game, intentionally exploiting in game glitches, offensive behavior, offensive emblems and offensive/unauthorized stream content. Repeated minor offenses will also result in permanent ban.
Read the full policy here.