I assume you read the headline, but if not, here it is again. Activision will release a full-length trailer for Call of Duty: Black Ops II‘s Zombies mode on September 26. You can check out a teaser trailer for the trailer (complete with a zombie bus) above.
Call of Duty: Black Ops II will be released for the PC, PS3, and Xbox 360 on November 13. A Wii U version will be released a few days later on November 18.