The trailer's been given a PG certificate, making it definitely scarier than the first Azkaban trailer which was given a U certificate.
And it'll be 1 minute and 45 seconds long, according to the British Board of Film Classification, the people who decide on film certificates.
The movie's out 4 June, but the date of the new advert's not known yet.
In the previous trailers, we've already had a glimpse of the dementors, Sirius Black and Hermione's mad cat Crookshanks.
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In the hotseat: Neville from Potter films
Neville Longbottom was our Guest Editor!
