Some might remember the Art Lebedev Optimus Maximus from several years ago. A fully fledged keyboard with an OLED display behind all the keys. It was the ultimate keyboard-gadget. Reality gave it a price of around $2,000 - making it the ultimate keyboard-gadget for an Oil Sheik, because it was far to uncomfortable to be used fulltime.
A small Australian start-up company called Sonder Design is tackling this ultimate keyboard challenge with a far more likeable sales-price. They're not using OLED displays underneath the keys of their Sonder Keyboard, but took the e-Ink route. There are 57 (if I'm counting right) customizable keys which allow you to change the visuals per application.
The target sales price will be $299, but if you pre-order you can get it for $199.
I'll be keeping an eye on this one. It looks promising.