Adam
Much of what makes this appealing has nothing to do with the render engine.  What I saw was some really excellent character animation / motion capture.  The rendering itself wasn't particularly jaw dropping.  And that's not a critique of unity.  Rather it's a critique of their chosen subject.  Metal, walls, and artificial objects in general are all very easy to render convincingly.  Show me some trees, grass, translucency, or volumetrics and then I'll be impressed.