9.4.100 is staging to be released but has not yet been released thus KBs and product documentation is being published prior to the release. There is not a specific date for release although it is in the final stages, as you see the product docs have been published, but still must clear the final few milestones in the release process. An SNS will be sent once it is released to world and available for download.
It is strange that it showed up under the software manager on two ePO servers for two days but has since disappeared. Thanks for the update.