A few bits from the main #bcachefs merge for #Linux 6.14:
https://git.kernel.org/torvalds/c/2622f290417001b0440f4a48dc6978f5f1e12a56
"'Lots of scalability work, another big on-disk format change. […]
Like 6.11, this is another big and xpensive automatic/required on disk format upgrade. This is planned to be the last big on disk format upgrade before the experimental label comes off. There will be one more minor on disk format update for a few things that couldn't make this release.'"