The Jive Winter 2015 Cloud Release upgrade window is currently scheduled to start on Thursday February 26, 2015 at 1pm PST and run through Friday February 27 2015. During the upgrade window, your site will be down for roughly 30-60 minutes. We apologize for any inconvenience.
Below are the upgrade windows by geographical region cloud instances are hosted in:
Trials and Preview Instances Feb 26-27, 2015
Production Instances Feb 27-28, 2015
The Jive Team