This is really the best news since sliced bread.

I was hoping for this since Lennart admitted that the originally claimed reasons for the merge were just marketing lies with the actual purpose to force users into systemd (which was of course not a surprising opening; only surprise was that Lennart admitted it in a sense.)
So far, I was able to dump systemd and all the *kit stuff from my systems, but I was afraid that udev could be the serious obstacle, because mdev is really only a poor man's replacement for udev, not really suitable for desktops.
Fitzcarraldo wrote:for the Gentoo developers to use this udev fork rather than the official udev which was merged into systemd in April?
I hope that they will make at least a virtual: There were already discussed plans for a virtual, but rejected because with actually only one upstream (at that time) it made no sense. Probably now they should change their mind.
For marketing reasons, it appears a bit unfortunate to me that the fork keeps the same name as original udev (but maybe this is necessary due to the license?) - maybe at least something like udev-ng or udev-standalone might be allowed?