Looks like ESRI has released the prerelease of ArcGIS Enterprise 10.9. You can download your software at my.esri.com.
Other info about this prerelease:
ArcGIS Enterprise 10.9 upgrades are not supported at the 10.9 prerelease. To see the new capabilities of the ArcGIS Enterprise 10.9 prerelease, a new installation is required. Upgrades from previous versions to the 10.9 prerelease are supported only for testing purposes. Do not upgrade production systems to the 10.9 prerelease. Upgrades from the prerelease version to the final released version are not supported. The final release of 10.9 will support upgrades from previous software releases as usual.
The following components are not included with the ArcGIS Enterprise 10.9 prerelease and will be available with the final release of ArcGIS Enterprise 10.9:
- ArcGIS Enterprise Cloud Builder for Amazon Web Services
- ArcGIS Enterprise Cloud Builder for Microsoft Azure