SharePoint 2016 IT preview has been released! Cloud first infrastructure, Large file support (10GB!), Durable links, Zero downtime on patching, App launcher, Cloud hybrid search are some new exciting features!!
You can download the SharePoint 2016 IT Preview at: http://www.microsoft.com/en-us/download/details.aspx?id=48712
As per Microsoft, SharePoint Server 2016 will become available in Q2 2016, with a public beta planned for Q4 2015:http://blogs.office.com/2015/04/16/sharepoint-server-2016-update/
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