just an idea, more designs to come:
this is my first design, it has two psp-styled nublet sticks, an XBOX D-Pad, and the standard ABXY buttons, as well as a left and right bumper and two triggers. The triggers would be spring loaded and could lock flat if you pushed all the way in and up. This would prevent them from hanging on anything while not in use. It has an XBOX 360 guide button to access the menu and a back and start button for navigation. The bottom has volume buttons, a hold switch, a USB port for charging and accessories (keyboard??), a regular headphone jack, and an XBOX 360 expansion port (for headset and upcoming keyboard). The same dashboard setup from the XBOX 360 would be used on the XBP, but it would be tweaked for the portable system.
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Here's my second concept:
Its not as detailed as the other one but i think you can see the idea. It has a swiveling screen that rotates out from behind the controls. This protects the screen when it is not in use, and makes the system smaller. The buttons would not work while the screen is closed to prevent accidental button presses while the screen is closed.
These are my first designs so try and be nice