I heard that a sneak preview of Twilight Eclipse will be attached to the upcoming Ultimate Edition DVD and BluRay of Twilight New Moon:
Update: the sneak peek at Twilight Eclipse is already online, you may watch it below:
ECLIPSE SNEAK PEEK
This Ultimate Fan Edition with collectible Lenticular Packaging includes a 7-minute sneak peek of 'The Twilight Saga: Eclipse' which begins with an exciting behind-the-scenes look at the production of the newest film in the franchise. New interviews with stars Robert Pattinson, Kristen Stewart and Taylor Lautner, as well as with series-creator Stephenie Meyer are integrated with revealing, on-the-set footage of some of the key scenes and sets from the upcoming movie. This first-look at 'The Twilight Saga: Eclipse' then concludes with the world premiere of an actual scene from the film between Bella and Edward that will surely have "Twilight" fans swooning.The DVD will be available at Walmart starting March 20, 2010. But I guess the sneak preview of Eclipse will find its way online soon after if not before.