October link from Reddit:
"The technicians narrowed the problem down to moisture content in the system, Potts said. And developers have a solution.
Another hurdle involved the field-of-view. Even the best goggle devices, a 40-degree field-of-view was the best range achieved, according to Potts. The IVAS program aimed to double that to an 80-degree field-of-view.
The problem, Potts said, was that pushed the boundaries of what waveguide technology is capable of at this time.
The wider field-of-view caused a stretching effect that slightly misaligned imagery in the mixed reality view."