Will it be open source? And does this implement any new efficiencies, or does it just provide extra controls? Also will there be a fee associated (like the BlissZ firmware for the D3)?

I would like to learn more about this. If there is any benefit to running this firmware, I can get a massive amount of hashrate on this. PM me if you can (you are not accepting messages right now).
I can provide detailed testing data on all makes and models of antminers produced within the past year and a half or so. Anything between 11TH and 14TH models, including all (if not most) hashboard makes (L1, L1D, L3, V4, V5, V6, C). I can also test Awesome Miner compatibility.

Features of use would be voltage and frequency control, first and foremost. Any other minor efficiencies would also be appreciated.
Odd suggestion would be web-panel control of the NTP settings. Right now they are using the public ntp pool by default, and there's lots of oddball sites that are connected to. The date information has proven to be fairly incorrect lately, and some machines exchange abnormal amounts of packets with these random servers. I randomly came across one that belonged to a Satan worshipper IRC that miners were connecting to for NTP and exchanging an unusual amount of packets on the regular (10x or more from a normal ntp response).  Just looks sketchy.

An auto-adjust function would be very useful as well, for frequency and voltage. For people who operate at extremely low temperatures, having an auto-adjust option would be useful for finding a safe overclock setting without all the manual setting of each machine.

Likewise it would be neat if an automatic fallback setting was implemented, so if temperatures begin to rise too much to operate, and the miner is presently overclocked, it will return to factory settings until temperatures reach a low threshold again. This in conjunction with the last suggestion would actually be really useful.