It's a wrap. I have released Plone 5.2.3 final:
https://dist.plone.org/release/5.2.3/versions.cfg
Traditionally, the release is not really official until we have a Unified Installer. But it is proving difficult to create one, so we may want to change this tradition. The 5.2.3 versions file is considered the latest and greatest, and safe for production use, whether there is an installer or not.