I highly doubt it. Dementors are only mentioned once or twice in general in Deathly Hallows (the most memorable mention is during the Horcrux search when Harry couldn't conjure a Patronus because of Tom Riddle's Horcrux locket) so the chance they would be in the trailer is very small.
Chat with our AI personalities
The last movie is named Harry Potter and the Deathly Hallows part 2
She was in Harry Potter and the Deathly Hallows Part 2, played by Kelly Macdonald
Charity Burbage, a professor in Harry Potter and the Deathly Hallows, will be played by Carolyn Pickles in Harry Potter and the Deathly Hallows: Part I.
Harry Potter and the Half-Blood Prince. Harry Potter and the Deathly Hallows parts one and two.
William Hurt does not play a part in Harry Potter and the Deathly Hallows Part 1.