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The Blizz PAX East announcement is...

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Vaelok
#1 - March 22, 2013, 2:08 p.m.
Blizzard Post
Hearthstone, a new online strategy collectible card game.
/discuss
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Nethaera
Community Manager
#72 - March 22, 2013, 2:38 p.m.
Blizzard Post
There is a forum over here->

http://us.battle.net/hearthstone/en/forum/9252662/

Feel free to discuss there. As always keep it constructive and remember that it's something you'll be able to play for free so I encourage you to reserve final judgement until you can try it for yourself.