The fact that they mentioned the communication ("We're going to share more than we ever have before") as a hook for the hype is a good and a bad thing at the same time: good because who doesn't want to know more about the game you play? But bad because (although things have got slightly better than in the past) we haven't received that much communication, which is what we were promised more than a year ago during the Year of the Dragon announcement video.
Hearthstone's last year had a lot of highs (Rise of Mechs, quick nerfs, Battlegrounds, 5 Galakronds gifted to everyone,...) but also a few and, I dare to say, non very justifiable lows (November's Shamanstone with no response other than "the meta is challenging", some DoD cards that were clearly over the top, even just on the paper, the need of a community uproar in order to push the devs to answer some problematics, continuous bugs patch after patch and brawl after brawl,...). No one is perfect and no one is asking for things to be always correct and bulletproof, but I think you got what I'm trying to say.
For what concerns the announcement, I'm not particularly hyped: not just because I find harmful getting excited over what is basically nothing (for now), but also because my expectations have been failed too many times. Game changing year? I really really hope so, but for now I'd like to keep my feet firm on the ground.