Blizzard announced that World of WarCraft players are now able to convert their in-game gold to Battle.net credit that can be spent on other Blizzard games.
This is a step up from the WoW Tokens which were introduced by Blizzard last year. The WoW Tokens can be bought using in-game gold and used instead of real money inside World of WarCraft. The new system is akin of the "Plex" currency that can be used in all CCP Games' titles.
The Battle.net credit can be used to buy stuff in games such Hearthstone and Overwatch. Moreover, it can be used to buy the games themselves. There is one catch though: you cannot convert Battle.net credit to cash and your balance would have a maximum balance unless you use Blizzard's authenticator to secure it.
More info about the complex system for buying WoW Tokens and Battle.net credit can be found in this FAQ.
