Actually, just in continuing to develop the game they did get to some graphics stuff between when the first set of released screenshots were created and E3.
From comments in the blog post
Divinity – Original Sin revealed !Well, the truth of it is that we actually haven't spent a lot of time looking at the lighting. There's still some layers of graphical detail that'll be added to it, and I think as development progresses, you'll see a lot of improvements.
I think you'll see a difference when E3 footage comes out already - we didn't really decide on the lighting yet & are fooling around with it for the moment.
