As far as I know, the first teaser will be released in November, and the first trailer in april...
Dunno where you heard about that, but I'm 80% sure there's no trailer out.
If there's a "trailer", it's probably one of those fan-made film. TheForce.net launched a "home-made trailer" before Ep.2 came out, but it had nothing to do at all with the movie.
~Dark Cupcake of the Sith