There's still no sign of the full-sized OLED-keyed Optimus keyboard, due to drop in 2006, but the Russian design firm Art. Lebedev Studio have announced the "Optimus mini three keyboard." They describe it as "an auxiliary keyboard with three keys, each complete with an OLED screen displaying the current function... Optimus mini is a blank sheet. It’s hard to say what a usual monitor is worth until you open an image on it."
Using the above example of Half-Life 2 for "game control," I have to question the value of the $100 peripheral. Sure, it's an attractive enough piece of kit, and the OLED screens are muy cool, but they offer little functionality above and beyond what any three keys on a regular old 104-key USB keyboard could.
However, if you've got $100 burning a hole in your pocket... the Optimus mini three is set to arrive May 15.