According to Marvel, HYDRA is responsible for leaking the SD trailer online, forcing them to release the high-quality trailer six days ahead of schedule (during next week's Agents of SHIELD).
The rumors are Marvel planned to debut the Avengers: Age of Ultron trailer during Agents of SHIELD next Tuesday, BUT somebody apparently decided to leak the international trailer (or so I read, not sure yet if this is the US version yet). In any case the full-length trailer was leaked online in glorious poor quality, but it's still watchable.
Just like the posters for the first Avengers movie turned into a massive poster, Marvel revealed the final pieces for this massively epic poster.
I don't know how long this is going to last, but watch it before it's taken down, it's really funny.
