Joystiq
Joystiq News
Blizzard has solidified Hearthstone's annual flow of retiring old cards and welcoming new ones: For the third year in a row, a new expansion will come in April that signals a sea in the digital card game. While we don't know the title or flavor of Hearthstone's next set, we do have a list of changes and new features that will arrive when 2017's Year of the Mammoth gives way to 2018's Year of the Raven.
Source:
Console Bang News!