‘Gustavo’ pointed us to this page which appears to have screenshots from the upcoming X-Men 3 teaser trailer. In actuality, however, the pictures show clips from both unreleased X2: X-Men United and X-Men 3 trailers.
The Jean Grey/Phoenix eye apparently is from a never-released X2: X-Men United trailer, while the claw clips at the end are from the “X3” teaser that was supposed to have played with Fantastic Four, but which they scrapped.
It is uncertain at this time when the teaser trailer will be released either in theaters or online. The third installment, directed by Brett Ratner, comes to theaters on May 26, 2006.