Hearthstone's China side is running a Battlegrounds tournament later this week and as a part of their promotion, Patches the Pirate can be seen beside the logo.

We are in the belief that this means we're getting some Pirates added to Battlegrounds, much like the Dragons-heavy patch that hit earlier this year. Apparently, this update is going to be arriving this week, so be on the lookout for official patch notes from Blizzard sometime this week and our usual datamining.

Thanks to geyuan6 for pointing this out!