Seems someone got a hold of the HD version of the Amazing Spider-Man trailer and uploaded it.
There's a big commotion going on about this in regards to Private Investigators and such on Twitter.
Check it out (takes some time to load):
The Amazing Spider-Man swings into theaters in 3-D and is directed by Marc Webb starring Andrew Garfield as Peter Parker/Spider-Man, Emma Stone as Gwen Stacy, Rhys Ifans as Dr. Curt Connors/The Lizard, Irrfan Khan as Nels Van Adder, Martin Sheen as Ben Parker, Denis Leary as Captain George Stacy, Sally Field as May Parker and C. Thomas Howell as Ray Cooper.
Head on over to the Cosmic Book News Amazing Spider-Man Movie Hub for more news, images and trailers.