Thanks to user VideoGameFrontReturn, the two teaser trailers for the upcoming K-On! movie can now be watched in decent quality on YouTube.
The first teaser premiered in April, and consisted primarily of clips from the TV anime. The only new material was a voice over by Yui and brief new animation of her greeting the audience.
The second teaser came out earlier this week, and like the previous one; does not feature any actual footage taken from the film.