Isn't there a controller that you can get for current consoles that allows you to swap out the position of the D-Pad and the analogue sticks?
I'd love to see something like that for the Orbis or the Durango.
I'm sure Sony will have something close to the design of the DualShock design but i prefer the Xbox 360's analogue stick positions. I don't have large hands and feel like my hands are stretched so to speak with the DS.
Keyboard input. Sony has a technology were a touchpad can detect your finger hovering above it, and you'd have a keyboard on the screen which you'd use you located your finger and input the correct keys.
Extra buttons, you could easily fit 8 extra buttons on a decent sized touchpad, you wouldn't actually see them on the controller but you'd know where to touch the pad to activate them.
A 3th or 4th stick input. Just slide your finger around the pad and it acts like a stick or laptop mouse cursor. Would be great for map control, just imagine pinch to zoom, rotate, etc.
The touch pad is clickable, click anywhere for start click bottom left for select (similar to the Macbook's touch pad).
In my previous one it was supposedly a tappable touch pad (tap to click, doesn't actually click).