We know that EP121 a larger display and keyboard, although still not clear whether the keyboard. In addition, there will be a small model within one of the Eee pad-EP102-seems to have a keyboard slide. Another EP101 appear with keyboard installed with EP121 larger both models is expected to have 10-inch display.
EP71 does not seem to have the keyboard arrangement. A stylus, which might mean a resistive screen display or position. This form might have a screen size of 7 inches.