Aside from the new expansion pack, Blizzard has also announced that Hearthstone Battlegrounds, an auto-battler game mode, will be made available for free at a later date.
Here’s the information shared via press release:
Blizzard unveiled Hearthstone: Battlegrounds, an all-newway to play. Hearthstone: Battlegrounds is a raucous eight-player auto-battler featuring 24 unique Heroes, in which players will recruit minions, strategically position them, and watch as they battle for supremacy.
This free game mode is designed as a standalone experience that uses Hearthstone as a foundation, but it does not require building or maintaining a card collection. Hearthstone: Battlegrounds will be available to everyone when it enters open beta on Tuesday, November 12. An early access period will be available from November 5–11 for everyone who attended BlizzCon, purchased the BlizzCon Virtual Ticket, or pre-purchased either of the Descent of Dragons bundles.
Beginning with Descent of Dragons, everyone will receive free access to Hearthstone: Battlegrounds. While nonessential for play, Hearthstone players will be able to unlock optional bonus features when they acquire card packs from the most recent expansion (starting with Descent of Dragons).
This includes free packs, those acquired with in-game gold, or those purchased with real money. At 10 packs, players unlock comprehensive stat-tracking in Hearthstone: Battlegrounds (slated for release following beta testing); at 20 they can choose from three different Bosses instead of two at the start of each match; and at 30, players unlock the ability to playfully communicate with their opponents using a visual emote system.
Hearthstone: Battlegrounds will have an early access for BlizzCon 2019 Virtual Ticket owner or the attendees, starting on November 5th. It will enters global open beta on Monday, November 11th.