The first Episode 3 trailer has only been available to starwars.com hyperspace members so far. Starting yesterday the trailer became available on free TV (first in the US). Today 8:13pm CET is the first chance for viewers over here, namely on German station Pro7.
Update: Pro7 Austria did not show it! Luckily the trailer available on the net already. Most download locations seem to be under heavy load right now, but the one at RealNetworks (RealPlayer required) worked for me.