A thread has gone up in the US forums questioning whether HW: Serenity is actually buffing critical strike chance or not. Many test results have so far suggested that the critical strike buff isn't being applied.
(thread) http://us.battle.net/wow/en/forum/to...3313738?page=1
I am hoping to get some people who have or are willing to run some logged tests so that we can bring more solid data into the discussion. If anybody is willing to run some tests for the good of the priest community, you can post results in the thread in the US forums, or if you are unable to post in the US forums, I can post links to your tests.