British morning show GMTV today presented a trailer for Harry Potter and the Goblet of Fire which contains lots of new footage.
Alternate streaming link #1 (thanks, Yoshie!)
Alternate streaming link #2
UPDATE: Higher-resolution with French subtitles (11.6MB)
(Thanks to Veritaserum.)
It's darker than previously released promos and includes deatheaters, Ron and Seamus joking during McGonagall's dance lesson, Cedric, Hermione and more!
As more and more footage is released, it's apparent the special effects in this movie are going to be "bloody brilliant," as Ron would say.