Unreal Engine 4 has been shown in all it's glory in this Tech Demo named 'Infiltartor'. As per usual gorgeous visuals, lovely effects and a setting of soldiers + guns is the bread and butter of this demonstration. The next-generation of games are undoubtedly going to look very nice.
Good eye!
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UPDATE
Looks like the demo was running on a single nVidia GTX 680.
Articles : Infiltrator: GTX 680-Powered Unreal Engine 4 Tech Demo Unveiled | GeForce