Expected release date for this is 3/20/2017 pending final testing. Look for release announcement here.
This update is important, as it is the first to automatically update all existing installed Skype for Business Cloud Connector 1.4.1 appliances, based on the update schedule that administrators have configured for their Cloud Connector Hybrid PSTN Sites. For managing auto update, see Understanding Cloud Connector Edition Auto Update.
For details on understanding how to prepare for Cloud Connector Edition Release 1.4.1, please our Skype for Business Hybrid Voice Team blog.