Partial Source: Pwinsider
CM Punk is currently banged up, and has been working through knee and ankle issues for several weeks. The Ryback attack at the Night of Champions PPV was done in part to give Punk some time off TV to recover.
Speaking of Punk, there have been several discussions backstage about his future with WWE. Punk's WWE contract is up next summer, which has many wondering if he will stay with the company.
We'll keep you posted as we hear more.