funnily enough I was thinking about that while trying to sleep last night.
Thinking of the form factor.
Thinking about the 6 pin headers each with a +3.3v, 0v and 4 gpio's.
Analogue's also on 2 of 6 pin connectors each with +4.092 & 0v, or maybe 4 of 4 pin.
That's the sort of thing that keeps me up at night.