Epic Games had a teaser up on their website with this image. With the image it also said “It’s Unreal. And it’s almost here.” Apparently the teaser wasn’t supposed to be up though, as the teaser was then removed.
Considering Epic Games develops the Unreal series and the teaser clearly says “Unreal” in it, its probably safe to assume that it has something to do with that. Who knows if it will be about the Unreal Engine or an actual Unreal Game.
We will just have to wait and see.