Currently, there is little to report about Hearthstone. The Senior Designer explains why these droughts occur.
The Timing Must Be Right
Since the gates of the “Explorer’s League” opened, it has become a bit quiet around Hearthstone, even the shifts in the meta are slowly fading, and everything is regaining that dull taste of “everyday life.” Fans are craving new information for future content. Ben Brode, the Senior Designer of the game, has now referenced these drought periods of news in a new video from the “Designer Insights” series.
According to Brode, there is a significant period during development when it would simply be unwise to release information. He revealed that work on the “Tavern Brawl” mode had been underway long before the initial release of Hearthstone. If this had been announced back then, the faces would have been extremely long when it turned out that the mode was playable only many months later.
In smaller scope, this issue also occurred with Naxxramas. They had talked too early about the upcoming expansion, so that fans could not wait any longer and loudly demanded: “We have known the cards for several weeks now, why don’t you just release it?”

From these past mistakes, they have learned and will in the future only announce things when they are truly sure they can deliver on these things on time. This may cause concern within the community that the developers are “just being lazy,” but this is definitely not the case. They are working on numerous new contents and will announce and present them in due time – but that time has not yet come.
For more information about the game, you can find it on our Hearthstone topic page.