See the Unreal 4 engine in action in this trailer for Primal Carnage Genesis.
Unreal Engine 4 Offered Free for Schools
Epic Games now offer educational organizations free access to Unreal Engine 4 for faculty and students.
Unreal Engine - Showcase
This compilation video shows off some of the games built wih Unreal Engine technology.
Eat 3D - UnrealScript MasterClass - Part 3 - Re-creating Assault in UDK
Eat 3D have released their 3rd DVD in the UnrealScript Masterclass Series, focusing on re-creating Assault in UDK.