Ladies and gentlemen, the overlay has been split and they're set up!
Current Gentoo/overlay users don't need to change anything: the URI is
the same and layman can still pull from it. However the URI has
changed and this one is kept only for backward compatibility. In order
to avoid a (completely harmless) warning when you issue layman -S
("The source of the overlay "sabayon" seems to have changed."=85), the
easiest solution is:
layman -S
layman -d sabayon
layman -a sabayon
and you are set up.
Every overlay committer would need to clone the second overlay. It's
available in layman too (sabayon-distro).
Here are the clone links:
http://git.sabayon.org/projects/overlays/for-gentoo.git and
http://git.sabayon.org/projects/overlays/sabayon.git (the second one
useful mostly for Sabayon developers).
Please report if you have issues. Enjoy!
