In case you hadn't noticed, Exchange 2016 RTM'd a couple of hours ago. Evolutionary from a 2013 perspective. Quite a few changes from a 2010 perspective.
Available for download already. http://blogs.technet.com/b/exchange/archive/2015/10/01/exchange-server-2016-forged-in-the-cloud-now-available-on-premises.aspx
