There is a comment on the Monarch thread, that the communication protocol is soon to be released.
https://forums.butterflylabs.com/announcements/4414-monarch-information.html#post72957
Are you still planning to Include this card into BFGminer?
I plan to begin on PCI-e when I get back from the Bitcoin conference in Miami.
Note PCI-e mode might require Linux 3.6+ for VFIO support.
Thanks Luke-Jr
These things may actually start arriving in the next 2-3 weeks.(BFL less than a year late )