It was reported during the Summer that more Blizzard games would be coming to Steam starting with Overwatch and Diablo IV. The next Blizzard game to join Steam is likely going to be Hearthstone according to a recent datamine leak.

First noticed by Outof.games, the code that makes Hearthstone run had several new references to the Valve platform. Here are the following references shared by the site:

The region switcher has had code added to check if its Steam.

Your achievements will sync to Steam’s achievement service.

A check to see if the Battle.net Client is used is disabled on Steam.

A button has been added for account switching, the same one used on mobile, when Steam is detected.

A mapping has been added to check against Steam’s language codes which differ from Blizzards.

There is specific store code to check prices for Steam’s platform.

Steam purchases will timeout after they fail to go through for 180 seconds.

What is very telling is that there is a new graphic available that will be used to link your Hearthstone account to Steam.

A release window was not discovered and Blizzard hasn’t announced anything just yet.