They've still got atleast another solid month and a half of filming before even thinking about editing together footage for a quick teaser...I doubt we'll get a teaser as short as the one described, but I'm sure that those are ideas being played around with until real footage is cut together. I'm sure after reviewing the dailies, WB execs and others involved will agree on certain things thus far, that they'll want to show. HP's release date is perfectly timed in the same month as Comic Con, which will be a perfect one-two punch to actually show something good, to both movie audiences and a major event like SDCCI.