The Year of the Raven, the next year of content coming to Hearthstone, will contain three brand new expansions. Blizzard didn’t say exactly what any of the new expansions would include, but they did tease all three of them, as you can see in the image above.
Here's everything we know about Hearthstone's Year of the Raven.
At this point we can only guess what that teaser is actually showing. Discussions around expansion one’s image in the PCGN office suggest it might be something to do with the Old Gods again, but my opinion is that those are thorns, not tentacles, which could point towards a Druid-themed expansion. We’re pretty set on expansion two being based on The Void, given the purple glow around that Magic Circle, but we have no idea what expansion three is - guesses range from Murlocs and Pirates to Shamans and Goblins.