Hearthstone's first fully fledged expansion follows up on the recent launch of Curse of Naxxramas, a single-player add-on that introduced new bosses and a handful of exclusive cards. Production director Jason Chayes told Polygon that the expansion's new content will roll out in waves, to preserve the game's pacing and to ensure accessibility for newcomers.
"One of the things that we spend a lot of time talking about is pacing," Chayes said. "Not just the pacing of the game as it is, but pacing of the rollout of new content. We really want to make sure the pacing is great not just for seasoned Hearthstone players but for new players coming into the game too."
Chayes notes that further details regarding Hearthstone's expansion will be announced "very soon."