The Epic Games official web site featured a cryptic teaser about... something, an Unreal-related teaser that has since been removed. That teaser featured the above graphic and the tagline "It's Unreal. And it's almost here."
That narrows it down to about 75% of the company's product line, meaning it could be related to Epic Games' Unreal Engine, the Unreal franchise or the Unreal Tournament franchise. Or it could be a new Unreal product altogether. Or Epic Games is screwing with us. What we're relatively certain it's not is a proper Unreal Engine 4, as Epic prez Mike Capps said that next-gen engine is still years away at this year's Tokyo Game Show.
So. Which is it? Best guesses in the comments!
Thanks to Jos for the heads up.