Niner since 2009
Are you asking about the underlying CLR Profiling API, or a particular profiler you're trying to use? (If so, which one?) The underlying CLR Profiling API does still allow IL rewriting in beta 1 as it did in CLR 2.
Here is a list of Channel 9 staff members.
CLR 4: Debugging and Profiling API Enhancements
May 27, 2009 at 12:23 PMAre you asking about the underlying CLR Profiling API, or a particular profiler you're trying to use? (If so, which one?) The underlying CLR Profiling API does still allow IL rewriting in beta 1 as it did in CLR 2.