(Click the image for a high-resolution look and more details)
Okay, so it's really a fan-made concept, based on rumors and the split second glimpse we get of it in the new trailer. But it's too damn cool not to share! I mean, a giant mutated whale?!? Awesome.

This was found on the Unfiction Message Boards, where the crazy people over there are analyzing every single clue about Cloverfield possible! There's a lot of fun theories and topics on the boards. Check 'em out!