Betanumerical: still doesn't look as good as the foliage shadowing in the top screenshot of the image I posted. The leaves are too opaque.
Edit: posted before Nebula replied. Yes, that looks better. I see no "pre-release demo" text so I assume it is not in the demo.
I have seen video from some Game conventions where they filmed the screen and the light through leaf was visible and enabled. That would make a blade block lighting for the other blade.