Here's my wish list:

* gyro so that we can run the cool fcam "lucky imaging" application.
* Full HD video recording.
* Higher resolution front camera. At least 800x600 pixels.
* Scratch resistant screen! Preferably resistive, but if that is not possible, then let it be capacitive.
* USB host for connecting external keyboards etc.
* More buttons to press when the unit is closed. You always find uses for these when writing programs. E.g. dedicated page up and page down buttons. Currently they are typically overloaded with volume up volume down.
* Make back side into a touch panel so that you don't have to smudge and cover up the front screen image with your fingers.
* Enlarge the touch screen outside the visible screen. Perhaps even on the sides of the unit.
* Long battery life.