Just being curious, I zoomed in the Tungsten|E picture 400% to check out the hard button and the D-Pad .... The result:
Very grainy but the 4 hard buttons are visible enough.
Well my initial guess was wrong. It looks like palmOne designed the hard-button to be similar to the Zire71, remove the Joystick Navigation and put in a T|T3 D-Pad.