We got informed about an Off-Cycle Update to Files Sync Product scheduled for May 28th.

"What is the change?

On May 28, 2015, we will be releasing new functionality, via patch release, for Files Sync users. Files in Salesforce Content, which includes Content Libraries and private files, can now be synced in Chatter."

The update installer never started, so what's wrong here?

Even when I download Salesforce Files Sync manually, it shows version 1.5, not 1.6 - any idea?