On the human interface/ ergonomics side. I think the addition of a track ball mouse and a scroll wheel would be nice. Both would be on the right side with the track ball operated by the thumb and the scroll wheel on the top surface operated by the index finger.

This will make the IT much easier to use like a desktop computer wiithout the need to hold a stylus or make large inefficient finger friendly UI.

Sorry. But once again make the browser faster and more responsive please.