HotS has entered another closed beta testing phase and there are several news to pleas players.
Watch the Beta Walkthrough:
Sky Temple Battleground Page
Sky Temple Developer Insights [Coming Soon]
Thrall Hero Week
From the Bullpen: A Tale of Two Shamans
Developer Insights [Coming Soon]
Coming Soon: Hero League and Draft Mode
Also Community Tournament Guidelines were updated and you can be sure that the game is still being developed and is only in beta. Changes to the game and Heroes are often and you must count with them.
Below is "an amazing build" for Thrall.