UPDATE: a new version has been published with the existing types (that include deprecated member) in bold to make them more visible
In a previous post, I made available the WinmdDiff tool to list the new types in WinRT 8.1.
Today, my new DeprecatedApi tool will let you figure out what are the types and members that are deprecated in a version of WinRT. As shown in the following screenshot, the default path where the .winmd files are parsed is where the Windows 8.1 SDK stores the Windows.winmd file.
In the forthcoming versions of Windows, you will simply have to change this folder to get the new deprecated APIs of WinRT.
I hope this helps.