I played the demo. Same thing as the E3 demo we've all seen a million times, but with different music.
Be warned that there is noticeable framerate issues in it. Hopefully this is because it's just the E3 demo build and not indicative of the final product. What throws me off about it being the E3 demo is that the music is clearly different in the executioner fight.
I will say however that I love how atmospheric it is, and the scenery looks fantastic. Plus I rather enjoyed the combat. The again I'm a bit of a 2D beat'em up fan.