The newest release of Exchange 2016 is CU3 released on Sept 14th 2016. Here is a link to download CU3 the newest version of Exchange 2016.
Exchange 2016 CU3 does contain AD Schema updates, so please factor this into your upgrade strategy
Exchange 2016 on Windows Server 2016 must use .NET framework 4.6.2.
Exchange 2016 on Windows 2012/2012 R2 must continue using .NET framework 4.6.1 until support for a newer .NET framework has been announced.
WARNING: At this time Microsoft is recommending that you not deploy CU3 on Windows Server 2016.