http://www.pcgamer.com/monster-hunter-world-trailer-introduces-the-elder-dragons/

A new Monster Hunter: World trailer introduces the Elder Dragons—mighty, element-breathing beasts who have migrated to the New World for reasons unknown.   

The video includes both "new and returning favorite" Elder Dragons, including Kushala Daora, a steel dragon who can generate windstorms around itself; Teostra, a flame king dragon who spits fire; and Dodogama, whose saliva causes rock to become explosive—a more useful talent than it first sounds, because Dodogama also eats rocks.