Combine that with the fact that Marvel Studios is releasing the Doomsday trailer earlier than it released any other Avengers trailer and more recent rumors ( via The Hollywood Reporter 's Heat Vision newsletter) that there will actually be four trailers released over the next few weeks,

Doomsday trailer leaked online today, becoming the third of the four-part teaser series to appear online. Fans got an early glimpse of the film, though much of its content remains under wraps.