If they've optimised the engine further as well as making it prettier, I'd be interested.
I had inexplicable FPS drops whenever I fired any of my guns. Everything exploding around me, multiple light sources moving and physics going crazy? 40 FPS at max settings. Fire my basic machine gun? Muzzle flash alone drops it to 24 FPS.
Really distracting which is a shame as I did enjoy the first few levels before the performance issues made me stop.