User blog comment:Callofduty4/Black Ops 2 campaign demo, much info released/@comment-4335023-20120522231055/@comment-3171236-20120522233836

It'll be at E3 in 2 weeks.

They usually show the E3 Demo early to the press (no cameras allowed), and then to the gaming community (cameras allowed) at E3. This was how it was for MW3 as well.