I've been following their development blog as well as the thread over at HF, it seems like it has the potential to be a pretty killer portable. They've been very open to answering questions and addressing concerns and suggestions as well.

Anyone else intrigued by a portable DAC with balanced amp that has both USB and iDevice connection?

maybe if it is iphone 5 compatible, we'll hopefully get a chance to check it out at RMAF

As far as I've been able to tell any of the accessories that take digital out should still work but they'll require the lightning connector. In the case of the M8 Michael Goodman from CEntrance has stated they should be including the proper cable for iPhone 5 compatibility. I'm not sure if that will happen right away though.

I'll be very interested to hear what you guys think of it at RMAF.