For the past few months, Harry Potter fan Aris and some friends have been working hard to compose a 23-minute trailer for GoF, consisting of the Third Task and the awful scene that follows.

Aris has put up a minute-long trailer of his video, which can be seen here - right click and save target as.

The final fanmade trailer is expected in a few weeks, and the teaser trailer for GoF is expected sometime in April.

Source: Veritaserum