For uses-cases like a staging-org, where several complex and interacting managed-package upgrades are to be tested, a preview participation is fatal: we can't install managed packages from current-release packaging orgs into preview sandboxes. So therefore we need strictly to avoid any participation of Sandbox Previews, because they are show-stoppers.
Now the Preview participation seems to be purely determined by time. According to this http://blogs.salesforce.com/company/2014/07/salesforcecom-winter-15-sandbox-preview-instructions.html all Sandbox creations and refreshes which happend after Jul. 30 and before Aug. 30 has been routed to preview-instances. And this routing-switch perpetuates before all new releases.
As an unfortunate this is really a very long time and we need to refresh/create current release sandboxes even during this time-frame.
So my questions are:
- Is the any way to create sandboxes during the Preview-Intervalls (which will be 3/12 or 25% of all the time in a year!) without getting routed into Preview?
- Is there something like a global preview-opt-out if you really can't participate with an Org?