The marketing machine behind the J. J. Abrams mysterious monster movie known as Cloverfield keeps on turning, with time release photos on the official teaser site, and a solitary trailer on the official site (see below).

See the history of the hype machine at wiki

"The sudden appearance of the untitled trailer for Cloverfield fueled media speculation over the film's plot. USA Today reported the possibilities of the film being based on the works of H.P. Lovecraft, a live-action adaptation of Voltron, a new film about Godzilla, or a spin-off of the TV show Lost. The Star Ledger also reported the possibility of the film being based on Lovecraft lore or Godzilla. The Guardian also reported the possibility of a Lost spin-off, while Time Out reported that the film was about an alien called The Parasite. IGN also backed the possibility of the same premise, with The Parasite also being the working title for the film. Chocolate Outrage was also a working title at one point during production.[8] In chats, Slusho and Colossus have been discussed as possible titles. Entertainment Weekly also disputed reports that the film would be about a parasite or a colossal Asian robot such as Voltron. "

Links: Official Cloverfield Website, Teaser Site