As the headphone connector is on the bottom and usb is on top, I suggest its just a matter of fact to have everything usable in portrait mode upside down (or not) in case someone creates a desktop stand it would be upside down and you wouldnt use the qwerty for input cause you dont want to lift it or detach it.

so I'd like to have all four orientations for everything as long as it is useful (eg phonecall just one portrait mode if not charging), the on-screen keyboard in portrait modes could/should have smaller caps?! or adjustable (fingers/pen) size osk caps at all cause some people like to use their pen instead of fingers from time to time or depending on case.