Enjoy,
Simply login your account and complete your daily quest. The quest should show you a pack icon next to the normal quest icon.
Sources:
https://www.hearthpwn.c
"…Quote from Blizzard
With the arrival of The Witchwood in Mid-April, the Year of the Raven begins! There’s good reason to flock to the tavern before that fateful day because we’re throwing a party that’s sure to make feathers fly!
To ring in the coming Hearthstone Year, we’re throwing a New Year of the Raven party! Every time you complete a daily quest*, you’ll also be awarded a card pack. These packs can be from Journey to Un’Goro, Knights of the Frozen Throne, Kobolds & Catacombs, or even The Witchwood! You can tear open The Witchwood card packs after the expansion goes live in April.
The party starts on March 26 at 11:59 p.m. PDT and lasts until April 9 at 11:59 PDT, so don’t be late!
Speaking of The Witchwood, the card reveal livestream begins March 26 at 11:00 am PDT! Bear witness to spooky new cards, LIVE!
*The Play a Friend quest will be disabled for the course of the event, but will return after it’s over…."
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