https://www.pcgamer.com/two-more-hearthstone-the-witchwood-cards-have-been-revealed/

Yesterday Blizzard said that Hearthstone: The Witchwood card reveals would kick off next week. Today, senior designer Peter Whalen blew that nice, neat schedule out of the water by revealing a trio of new cards in the expansion as part of a dive into the process of creating the new Echo keyword. 

(To be fair to Peter, it's not like he's ruined everything, I just wasn't expecting new cards quite so soon.)