In a recent dev diary Peter Whalen explained the Echo mechanic in the new Hearthstone expansion, The Witchwood. In the video, he revealed and explained some of the new cards that the expansion will bring.
And in a live stream on Twitch yesterday, Peter Whalen and Dan Chou revealed even more new cards and explained their features and how they function. You can take a look at the cards down below, and check out the livestream for more information about each card.