The best idea I've seen!!!
It just gives more space to show off the content! Seeing Xiuquatl and Mythwright Gambit in it's glory is so much better than showing when a character blows into Verdarach and you see briefly some ghosts or insignificant spider.
Good job marketing team and designers! This is the best idea to keep interest of the people, and it's a very good idea you release those videos on your social medias like Twitter- to get to more people.