Currently, there is an error:
install-package : Updating 'EPiServer.Framework 9.0.3' to 'EPiServer.Framework 8.0.0' failed. Unable to find a version of 'EPiServer.Packaging' that is compatible with 'EPiServer.Framework 8.0.0'.
When can this be expected?
Although quite straightforward, Jumping from CMS8 to CMS9 is still a breaking change. That why our AddOns (included GA) need to rebuild with CMS9.
UPDATE 2015 Oct 14: EPiServer GoogleAnalytics 126.96.36.19900 for CMS9 http://nuget.episerver.com/en/OtherPages/Package/?packageId=EPiServer.GoogleAnalytics
EPiServer GoogleAnalytics 188.8.131.5200 is now on CMS9