Epic Games’ vice president Mark Rein told G4TV that Epic Games will have a running preview of the upcoming Unreal Engine 4.
Rein was quoted saying to G4TV that, "People are going to be shocked later this year when they see Unreal Engine 4 and how much more profound an effect it will have." The Unreal Engine 3 has been around for quite a while, so seeing its predecessor and how it looks in comparison.
Unfortunately, Rein didn’t say when it will debut, so we’ll have to wait to see what Epic Games has to offer later this year.