Patrick actually had a built (populated PCBs) - but not yet tested - kit at the Amersfoort meet. And some very nice ideas on extensibility - there will be space - just - in the box for a third PCB (Tuner kit uses 2 stacked PCBs) that could house various nifty things... You could also add even more cards if using another box, or linking to an extra box with wires...
There was talk about even more I/O, accellerometers (with possible linking to visuals - the star fields could react to accelleration, braking, turning...
)
/Michael