If you’ve written a profiler that consumes the CLR Profiling API, and are looking to update it to analyze Windows Store apps, then you’ll be interested in this new whitepaper:

http://go.microsoft.com/fwlink/?LinkID=271485

The whitepaper provides recommendations for all the changes you’ll need to make so your profiler can profile Windows Store apps.  As you read through the whitepaper, keep in mind that the source code to CLRProfiler 4.5 can also be used to illustrate many of these changes you’ll need to make.

Happy coding!