If anyone is interested, CM Punk was on the Art of Wrestling podcast this week and besides talking about his time in the WWE (both good and bad), also revealed stuff that eventually lead to him suddenly leaving.
The thing that broke the straw was him getting a concussion at the Rumble and the mess regarding how the WWE wanted to handle his medical tests.
http://www.stitcher.com/podcast/art-...ing/e/36106222