According to that one dev, they've done some very interesting things with the finalized version of the controller.
I know: They will reveal that the touchpad is in fact an OLED display afterall, allowing localy streamed Vita (& PS1-4) games to be played on the controller. Ha! U heard it here first. Confirmed by an inside source I know quite well: Mya Assquith.
Or they'll just reveal more colours. ;-)