For those who haven't run across soft-releases before, this is the
last step before the final release. Because things haven't been
finalized yet, some packages may change between now and the release. It
is not recommended to use soft-releases in production.
I can confirm that my JS problems with xmldirector.plone and all former Plone 5.0 releases are apparently solved
(tested against latest buildout.coredev).