SSRS 2016 Report Designer uses the new 2016 schema definition for rdls, which is NOT supported by the v12 control:
http://schemas.microsoft.com/sqlserver/reporting/2016/01/reportdefinition
So, if you upgrade your SSRS to 2016, and you updated your developer tools, and you use the report viewing management tool in your own web application (which you should be, or you wouldnβt ask correctly). You will then have v13 Report Viewer to use.
If your RDLs cannot be edited using the latest developer tools, the v12 report viewer should still display them, although I have not tested this script against the latest CTP
The v12 report viewer is backward compatible with 2005, 2008, 2010 and, of course, the 2012 schema definitions (which are used by the 2014/2015 report developers).
So, if your team upgraded to VS 2015 Update 3 using the latest SQL Server data tools, then you will begin to see how the 2016 report definitions appear when they are edited.
previous versions of SQL Data Tools would only update the definition of RDL when using one of the new features, this new version seems to update them no matter
There is no official download of the client executable for the v13 report viewer, you will need to extract the necessary DLLs from the GAC from the server using SSRS 2016 running on it, or from the development machine with the latest data tools installed. If you encounter problems, look at the ReportViewer.aspx file in the SSRS 2016 web application folder for the latest syntax changes.
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