With Revit 2016 officially out, I am working on updating my addins for 2016. One of the most invaluable addins has already been updated. Per Jeremy Tammik on his website, http://thebuildingcoder.typepad.com/blog/2015/04/revit-2016-api-news-and-devdays-online-recording.html, RevitLookup has been updated for Revit 2016.
You can get the source code here: https://github.com/jeremytammik/RevitLookup/releases/tag/2016.0.0.6 and build it yourself.
Or you can download a zip with a version that I have already built here: https://app.box.com/s/5hxbjrtgk77a80uwvycvfxinjvo9tzvt
Just extract the contents of the zip file into your Revit 2016 addins folder ( C:\ProgramData\Autodesk\Revit\Addins\2016\ )