Unreal Engine Sizzle Reel
Epic Games have posted a showreel of games and media created using Unreal Engine.
Kite is a cinematic created in Unreal Engine 4 and features a diverse and beautifully realized 100 square mile landscape.
SideFX GDC Reel
SideFX are showing how Houdini's procedural pipeline helps game developers save time and increase creativity in production.