I'd be interested in seeing it perform in real world situations, specifically with respect to horizontally and vertically polarized light. I can see why they avoided it in the study, using circularly polarized light, but in the real world, it could be very helpful to the owner to help in navigation, as the polarization of the sky is anisotropic.

PS: You can manually create light fields. Take multiple photos of the same subject from slightly different locations. Then use hugin (the panorama stitching program) to align them on a given region, and merge them together. You can create a virtual focus plane of your choice.