We will be pushing a Zuora for Salesforce maintenance release (Quotes 9.7) to all 9.6 and 9.6.1 Sandbox orgs after 5 pm Pacific on Aug 24.
The push upgrade to all 9.6 and 9.6.1 Production orgs will be scheduled for after 5 pm Pacific on Sep 5.
Quotes 9.7 provides several features and fixes. Please refer to the release notes for details.
I am assuming you meant August 24th and not 23rd for the sandbox deployment.
It would be great to have an announcement here 24 hours before a release so we can be aware.