We're not getting a Warcraft trailer until November, but Legendary Pictures has released the movie's Comic-Con VR teaser, letting you soar through Azeroth in your browser. It's awesome.
I've never seen anything like this before, but by dragging your mouse around the YouTube player, you're able to look around and see the city of Stormwind on the back of a gryphon.
(Note: This really only works if you're viewing it through Chrome. It looks busted and broken on any other browser. So if you're wondering what all the fuss is about, that might be your issue.)