Blizzard announced a new game mode called Heroic Brawl.
http://us.battle.net/hearthstone/en/...awl-10-17-2016
Seems like a combination of Arena, Constructed, and the long-wanted Tournament Mode:
Quote:
Heroic Brawl will challenge even Hearthstone’s most experienced players as they vie for glory and in-game rewards! Participants will create a Standard deck from their existing card pool and lock it in before their first Heroic Brawl match. No changes can be made to your Heroic Brawl deck once you’ve locked it in, so be sure to do a bit of testing before you finalize your deck.
Once you’ve locked in your Standard deck for Heroic Brawl, you’ll be pitted against other Heroic Brawlers in heated battle. Just like the Arena, you want to shoot for 12 wins to get the best rewards—but if you get three losses, you’re out!
For Hearthstone’s best brawlers, 50 packs, a heap of Gold, piles of Arcane Dust, and three golden Legendaries sit at the end of the 12-win rainbow. The rewards are significantly different than what you have come to expect in the Arena, and the more games you win, the better they get. Are you ready to take on the best and brightest of competitive Hearthstone?
Heroic Brawl lasts for only one normal Tavern Brawl week and has an entry fee of $9.99 USD or 1000 gold.
Minimum prize is 1 pack.
Also, looks like this won't be a permanent thing, just replace the Tavern Brawl for a "week" at a time.