Battery fuel guage is almost ready for FP4 at least:

fosstodon.org/@z3ntu/115435804332775702

And there has been recent successes by the same guy (employed at Fairphone) on getting cameras working (main post of the thread linked above).

These are recent improvements, and I really hope they can solve the audio stability and GPS stuff so I can move. Thinking of trying out Ubuntu Touch before a mainline distro is ready.