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If you must consume every detail of Hearthstone news then you should tune in to an upcoming Blizzard Twitch livestream. Ben Brode will be around to talk about some of the new cards as well as, hopefully the expansion release date. If the rumored April 26th date is correct then this might be all the information we've been looking for.

"The Old Gods will soon begin their invasion of the tavern, and we’re compelled choosing of our own free will to show off more of the ominous (and super fun) cards they’ll be bringing with them!

Join Lead Designer Ben Brode and Hearthstone master caster Dan “Frodan” Chou on April 21 at 10AM PDT for what promises to be a thrilling series of show matches against members of the Hearthstone design team. We’ll be unveiling a number of new cards from Whispers of the Old Gods, so you’ll want to be sure to attend!
"

http://us.battle.net/hearthstone/en/blog/20095516/hearthstone-live-stream-whispers-of-the-old-gods-4-13-2016