I've personally been looking forward to these keyboards. If you're unfamiliar with OLEDs, you can find more about it on WikiPedia's OLED article. Basically, they're very tiny LEDs that can provide red, green, and blue color. Mixed together, you can generate any color as an RGB triplet.

What's so cool about these new keyboards is that each key will have an OLED array inside, allowing the user to change the actual look of every key on the keyboard.