https://screenrant.com/cinemacon-2018-movie-trailers/..
The third (and final) How to Train Your Dragon movie won’t be hitting theaters for another year (March 1, 2019), but it may be getting an early tease at CinemaCon this year. Officially subtitled The Hidden World, the film will revisit the franchise’s core characters as Hiccup and Toothless do battle against the villainous Grimmel (voiced by F. Murray Abraham) in order to maintain peace in their dragon utopia.The film has a presence at CinemaCon, so it would definitely make sense for a teaser or some other form of footage. While being almost a year away may make it seem unlikely this would be released to the public any time soon, the first teaser for How To Train Your Dragon 2 actually debuted eleven months ahead of time, so it’s possible we’ll get it online in the near future.