See it in HD at Yahoo.
From The Moving Picture:
More after the break!
Click on the pictures or the link to see the high resolution Mr. Fox stills at Ain’t It Cool News.
According to the Wikipedia entry for the film, the trailer for Fantastic Mr. Fox will be attached to Ice Age: Dawn of the Dinosaurs, which opens July 1st. There’s no citation in the entry for this information (it could merely be derived from this IMDb message board post), but it would make sense as both films are Fox releases and were produced by Blue Sky Studios.
Either way I wouldn’t be surprised if the trailer were released online before then. In the meantime, there’s this.