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Also very interesting:
The effect seems to waver in time with the movement of these segmented walls.
This is either a fun art direction choice, or (and I think more likely) a happy accident of the effect sampling motion vectors in the scene to give it a pulse.
Neato
I also notice a little bit of crunchy, sparkly stuff in high-contrast screen regions moving over the top of the ray traced reflections, probably because of a combination of caching and anti-aliasing+motion blur being a frame behind or something along those lines.
Beyond the book itself, another reason I'm excited about playing this is because Dishonored has some absolutely PHENOMENAL maps of various styles, and this provides background info and supporting details for all of them.
Here are a few of the in-game ones: