Answer: Both will be playing at BlizzCon 2014.
This year the annual celebration of all things Blizzard will see the first ever Hearthstone World Champion crowned, after months of battling it out for a slice of $250,000 worth of prize money. We first reported on the competition back in May, and since then competition has been fierce, as the best of the best fought for their seat at the finals table.
Closing out BlizzCon will be a live concert from none other than Heavy Metal behemoths Metallica. If you're not able to be at the show in person on the night of November 8, Blizzard has a solution with its BlizzCon Virtual Ticket (full details here). As well as being able to see the concert live and in HD, the virtual ticket will get you all sorts of other Blizzard-related goodies.
Blizzard's accessible yet deep card-battler Hearthstone is available right here for free, and you've now got 12 months to get practicing for the 2015 crown.
Here's the Hearthstone trailer: