As you can see on Hearthpwn.com - The Grand Tournament Patch - Animated Cards, Gameboard, New Sounds, New Dailies, Card Flavor Text - News - HearthPwn
They managed to download patch from Blizzard CDN and unpack it. I want to know how do they find this new client? How did they managed to download it? I know how to extract it I just have no idea how to get it.
And the second question is that you can see them probably emulating hearthstone server to show off the new board:
How did they do it?