According to Apple Insider, Apple has filed a patent for a dynamic, OLED-based keyboard that will allow on-the-fly keyboard layouts via software. Each key would have a matrix of OLEDs (organic light emitting diodes) that display that key's currently configured character.
Not only would this dynamic keyboard design be able to show you the effects of meta keys on standard keys, it would also allow for swappable language configurations. As a user with a bizarre keyboard fetish, I would personally jump all over this, even if it didn't have the Matias Mechanical Keyswitch.
[via Apple Insider]