NSHQS extend AS4187:2014 implementation deadline

Just yesterday, I received an email informing me that the AS 4187 compliance deadline of December this year had been extended.
The news surprised me. Our subscription to SAI Global Standards watch would normally have alerted us if there had been an amendment in the standard. So I searched high and low on the SAI Global site and then Standards Australia and then the old trusty Google.However I was unable to find anything. So I mentioned it to our Office Manager who then went off and tried her luck with Google.