The Office 2016 December 2016 updates and cumulative updates are now available, please see the links below:
https://support.microsoft.com/en-gb/kb/3208595
Project 2016 December 2016 update:
https://support.microsoft.com/en-gb/kb/3127994
SharePoint Server 2016 / Project Server 2016 December 2016 update:
https://support.microsoft.com/en-gb/kb/3128017 & https://support.microsoft.com/en-gb/kb/3128014
The Office 2013 December 2016 updates and cumulative updates are now available, please see the links below:
https://support.microsoft.com/en-gb/kb/3208595
Project Server 2013 December 2016 CU Server Roll up package:
https://support.microsoft.com/en-gb/kb/3128003
Project Server 2013 December 2016 update:
https://support.microsoft.com/en-gb/kb/3128009
Project 2013 December 2016 update:
https://support.microsoft.com/en-gb/kb/3127978
Also worth noting, if you haven’t done so already, install Service Pack 1 http://support2.microsoft.com/kb/2880556 first if installing the December 2016 CU.
As always, fully test these updates on a replica test environment before deploying to production.