Might not be exciting to everyone, and I understand you might not want to release only this, but I think it would be nice if you could release a free-software-only variant of Fedora:
We get a lot more people telling us that this would be nice than people willing to step up and do it. :) If we had the latter, I wouldn't be opposed at all to such a Fedora variant. We also make it very easy to make a Fedora Remix which follows stricter interpretation like this (and some of those on the list above are based on Fedora).
The practical problem is that very little hardware today will even work, making it a kind of academic exercise.
There's also an _academic_ question which I find makes the particular line drawn here somewhat odd. All non-trivial hardware today requires firmware/microcode of some sort. Loading that at runtime vs. having it baked into an EEPROM doesn't seem like a really important distinction to me.
https://www.gnu.org/distros/free-distros.html
https://www.gnu.org/distros/common-distros.html