Update: Please visit this blog post for the reveal!

Earlier today, the Hearthstone twitter revealed a Gif showing off a brand new button under The Arena on the main screen. However, it currently doesn't have text letting us know what it is. Could this be the rumoured Tournament mode or do you think it's something else?

According to Zeriyah, new heroes, such as Magni Bronzebeard, will be chosen in the collection manager and therefore are not likely to be the purpose of the button.

@CM_Zeriyah @mbagillespie How does this selection process work? In the settings or when you click 'play ranked'

Update: The Hearthstone twitter has now tweeted another image which features a brawl in a tavern. This could possibly indicate a tournament mode addition or some other type of multi-person mode.