I found out that the first 26 pins are the same on both versions. (http://raspberrypi.stackexchange.com/questions/28589/is-the-26-pin-pi-cobbler-compatible-with-the-40-pin-raspberry-pi).

What this means is you can force the old ribbon cable on to it, (the pins don't bend that much), get a downgrade cable (https://www.adafruit.com/products/1986) or a stacking head (https://www.adafruit.com/product/1979) and chop pins 27 and 28 to make more room.

Curious to see if the new A4 uses a pi at all.... I imagine it would as it's an easy interface. Wonder if anyone can confirm.