Whoa, I wasn't aware there may be other editions of F9 in the works!Thanks. Sharing a screenshot from my facebook fiio page.
I may hold off for a while, the Pro and Ltd is interesting. I see also you commented on MMCX connector. I agree it's a fiddly connection and doesn't seem very robust. Personally I've never had a problem with any of my IEMs. I had Shure SE535 IEMs with a Linum BaX cable.