This is new for film. My film guy was telling me about this whilst working on my Frozen. Its the same tech that has been around for years for glass (solid). All based on being an electrochromic device. The difficulty has been getting these particles to sit in a flexible film rather than glass, be reliable, and act consistently across the entire film.. oh and make it cheap, and easy to apply in custom fitments..
Pretty cool, and also it can be used to wrap your entire car. where by you can change the electrical charge across it at different voltages to change the translucency at different levels.. could be pretty cool and introduce some neat effects.