The Particle Raspberry Pi beta has come a long way, but I feel it is approaching completion.
My one question right now is:
Will there be methods for directly controlling Bluetooth and BLE on Raspberry Pi without requiring process control?
Also, I think it would be great if an official pHAT was created to assist users with the pinout, add a RGB light similar to a photon to get the status of the firmware and device, and maybe an ADC or other special pins.