Prereleases weekend of July 27 and release events the weekend of Aug 3rd.  (Sign up for events here.) Events at D20 Games are friendly and welcoming for new and experienced players alike.  Get prerelease kits with 6 packs and make your best decks and have fun playing.  We do win a round, win a pack to keep things interesting, but also to have people there for the fun of the game.  Events are $35 in advance and $40 the day of the event. (The new packs are the play boosters, which are a blend of the old draft and set boosters...basically a draft booster with a much higher chance of getting more than one goodie.

In Bloomburrow, the Valley is threatened by elemental forces raging out of control, and salvation falls on the shoulders of its smallest protectors. Players will put their best paws forward, fighting alongside mice, frogs, bats, birds, and myriad other critters to restore the balance of peace—and prove bravery comes in all sizes.

Here is the good stuff info.
All the Cards:

The new mechanics:

The official back stories... First, Second, and Third.