I think the raspberry should get more cool hardware like the camera that works with the slot onboard. I'd love to get a fast RS485 onto this slot because i need all my GPIOs for LEDs. Currently I use 2 raspberries, one to recieve data from RS485 over a RaspiComm and a second one which outputs data to LEDs over GPIO. There raspberries are connected via LAN. Is there a way to do this only with one raspberry? I mean receiving data and setting some LEDs blinking?
The camera port is not a general purpose port. It is connected to the GPU directly and uses either CCP2 or CSI-2 (camera specific protocols) to communicate with the camera.
Have you looked at the P5 header that was added on the Rev 2 boards? It makes 4 additional GPIO ports available.