https://www.pcgamer.com/hearthstone-the-witchwood-is-live/

I hope you've got your "janky evens-only decks" ready for action, because the big moment has arrived: Hearthstone: The Witchwood is now live. Blizzard has rolled out the expansion worldwide, except for China, where it will arrive several hours later. Current estimates have it coming at around 6 pm ET. 

Don't forget that logging into the game will, for a limited time, net you three card packs and a random Class legendary from the expansion. And in case you missed it, we recently spoke with Hearthstone game director Ben Brode about the expansion, recent troubles with the ladder, and the never-ending quest for the Unicorn deck.