The Comic Con ExPerience (CCXP) in Brazil happening the second weekend in December just announced this yesterday-
[Translated from Portuguese to English]
"The "How to Train Your Dragon 3" animation – one of the most awaited premieres of 2019 – has just been confirmed in the Comic Con Experience. Universal Pictures brings to Brazil the director and screenwriter Dean DeBlois for the panel on the last day of the event, December 9th. Fans will be able to check out unpublished contents of the new Hiccup, Toothless and movie newcomer, Fury of Light, and participate in an interactive activity in the film's special stand.
Produced by DreamWorks Animation, the third installment of the franchise is the first to be released by Universal Pictures in Brazil. The film accompanies the character Hiccup and the realization of his great dream: to find a peaceful home where dragons can live safely. There, Toothless discovers a companion, just like him, but somewhat savage. But it is when the danger begins to come around their home, that the duo Toothless and Hiccup will be tested and need to make difficult decisions to save their species."
So... we might have one more chance to learn of new spoilers! Granted, NYCC promised "new" material but everything we got there had already been covered already at either Annecy or TIFF, so their definition of "new" may simply mean that it hasn't been available to the general public. Also, does anyone know of any Dragonites in Brazil? Because we may have a hard time finding someone who will care enough to not only take special note of everything that happens at the event, but also to report back to us on it. I'm wondering what this interactive activity might be!