The Alligator board sounds very much like the Duet electronics (which has been available for more than a year), but with the DRV8825 stepper drivers instead of the A4982, and an extra fan output. The use of the same processor should also make it easy to port RepRapFirmware to it. It's a shame you didn't put a 5th stepper driver and second hot end output on it, because my main criticism of the Duet is that you need to add the expansion board to drive a dual-nozzle printer - and 2-nozzle printing is very common these days.
What is the projected price of the Alligator?
What is the projected price of the Alligator?