Every comic site just started to report that at the exclusive screening of the Item 47 Marvel mini movie (and available on the big Avengers Blu Ray set) a big teaser was said.
A little kid asked about Ant Man and was told to pay attention at tomorrow’s Marvel Movies/Iron Man 3 panel.
Edgar Wright Has also definitely filmed “test” footage.
Tomorrow will be very interesting.
(Update: Just traced this back to the original source, I should have known Bleeding Cool had it down. http://www.bleedingcool.com/2012/07/13/marvel-to-detail-plans-for-ant-man-in-hall-h-panel-tomorrow-night )