Video is in Russian, but shows the new Arid Ruins mode and the new hero in action. I am sure someone will soon make one with more details in English, but this was pretty well done.
New mode and new hero
If anyone has any questions about what was shown, I can try to answer them. I know Russian
Name: Rusty (Rustyx in game)
Guild title: resident wisenheimer.
Line ID: Rustytroll (big shock there, eh?)