Focusing on teaser trailers

As our brief was to create a teaser trailer, as well as looking at trailers for inspiration and shot ideas, I'm also researching the conventions of a teaser trailer specifically and the ways in which it differs to the usual theatrical trailer.

I found a good definition on http://en.wikipedia.org/wiki/Teaser_trailer
'Teasers, unlike typical theatrical trailers, are usually very short in length (between 30–60 seconds) and usually contain little, if any, actual footage from the film. Sometimes, it is merely a truncated version of a theatrical trailer. They are usually released long in advance of the film they advertise. One of the reasons for the name "teaser" is because they are shown usually a long time (one or one and a half years) before the movie comes out, so as to "tease" the audience.'

The most obvious difference between the two trailer styles is in length, so the teaser trailer I'll produce will be shorter than typical theatrical trailers and so it is even more important in this case that the shots are short and powerful. However this may be considered easier to do for a teaser trailer as it can be ambiguous with very little or no cohesive narrative.