The Samsung Alias 2 keyboard is indeed using E Ink, at least according to Engadget

Samsung has a new phone, called the Alias 2, that is due soon, and has a keyboard in which each key is a small "display". Engadget now claims that they got it confirmed - it uses an E Ink display.

Samsung Alias2

The phone is said to cost only 79$... It should be interesting to see how this story unfolds later this month.