https://www.reddit.com/r/hearthstone/comments/57y4al/introducing_heroic_tavern_brawl_news/?st=IUEB82A0&sh=28cad710
1000 gold or $10 to enter arena-style, standard gameplay with a locked in deck. Prizes scale to ridiculous prizes for 12 wins. 0-3 gets 1 pack.
Essentially tournament mode using the tavern brawl this week. Seems interesting.