Are gamers interested in the beta test of Hearthstone: Heroes of WarCraft required to live in the US?
My Battle.net account is set to European and I could apply for the beta, so at least Europe is covered as well.
I just read through the Hearthstone FAQ and it states the following:
This means that for now, only US residents can play the beta, but other regions will follow after the initial beta-test launch.
UPDATE 08/10/2013: The Hearthstone Closed beta is now available to selected European Players as well.