Thanks for the responses earlier, Jason and Maxvla. I hadn't seen the FAQ on the Web site before and had only briefly looked at the specs. It now seems likely that I'll buy the amp, if not the DAC too, when they come out. The amp in particular ticks a lot of boxes on my checklist. 
I have a few more questions for Jason:
1 - Is the "one pair dual 3-pin female XLR" output listed on the Mjolnir specs a loop output? I'd assume it is but just wanted to make sure.
2 - Is the gain of the Mjolnir modifiable - either by Schiit or the user? Specifically, can the gain be lowered for an individual amp?
3 - Will the Mjolnir be displayed at the upcoming THE Show Newport Beach? If so, will the Audeze LCD-3 be part of the headphones available to demo with?