Check out this link from Crunchgear:
http://www.crunchgear.com/2009/05/11...aunches-today/
Looks like the keyboard is what is eInk:
"The phone sports a keyboard that, through the magic of e-ink, changes to meet the phone’s usage. It displays a standard number keypad when in normal phone mode and a QWERTY keyboard when in texting mode. Amazing."