Yanko Design is back again today with another concept design that we'll probably never see on the market. The E-inkey Keyboard concept is based on the look and feel of Apple's iconic keyboard, only it adds a trick that Apple isn't yet using. Like the Optimus Maximus keyboard, all of the keys on this concept design have a tiny screen integrated into the surface. But while that other keyboard used OLED screens, the E-inkey Keyboard concept uses E-ink screens.
It's still only a concept design, but the simple replacement of one screen tech for another could mean a lower energy cost because the E-ink keys would not need to draw power to maintain an image. Theoretically this design concept should be possible to replicate on mobile keyboards like Apple's or on laptop keyboards.
I don't expect to see it, though. This would likely be a very expensive piece of hardware as well as difficult to build. Even if it was successfully funded via pre-orders (Kickstarter here my plea), I'm not sure that the technical bugs could be worked out.
But I still want one.