This technet link gives a detailed explanation of the deprecated or removed features in SharePoint Server 2016 IT Preview.
https://technet.microsoft.com/en-us/library/mt346112(v=office.16).aspx
Note: Since this is only the preview version I think this list is subjected to change in the mere future . Also please be mindful that the “Tags” and “Notes” feature is removed in SharePoint Online too.
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