According to ReelZChannel, there is a super secret url (web link) hidden in the trailer for the J.J. Abrams directed and Steve Spielberg produced sic-fi movie Super 8.
You can see the trailer below, I haven't been able to find it, but the link is valid.
You can check it out here: http://www.super8-movie.com/editingroom.html.
It takes you to a site where you can see footage of what appears to be some kind of "top secret" experiment set in the 60's.
So far, they have three clips up. Judging from the amount of empty slots on the movie reels, eventually the entire clip will be made available.
Not much as of right now, but give it some time.
Set in 1979 Ohio, the film will follow a group of six young children as they use a Super 8 camera to make their own home movie. One night while filming near a remote stretch of railroad track, the children witness a truck collide with an oncoming train leading to a catastrophic derailment. Amidst the fire and destruction, something emerges from within the wreckage, something inhuman.
Super 8, due out next summer, is directed by J.J. Abrams, produced by Steven Spielberg and stars Kyle Chandler, Amanda Michalka, Elle Fanning and Zach Mills.