Moments ago, ComingSoon.net received a package marked with a logo for something called 2nd Mass containing a bubble-wrapped object with a note marked "PLAY ME".
Inside that was a beaten-up flipcam and a charred note that read, "You have been chosen to join the 2ndMass PRESS PLAY 2ndmass.com"
The website contains geographical markers pointing to a location that Google Maps indicates is in San Diego. Meanwhile, one of the website's hyperlinks contains a countdown clock that seems to indicate that something will be happening during the con.
The address on the back of the package matches that of Turner Entertainment.
UPDATE: If this is a Turner property, the most likely candidate is Falling Skies, the new Steven Spielberg-produced series that has announced plans for Comic-Con.