If you have info to that effect, by all means share. It looks like a duck, and sounds like a duck, but only the ducks know for sure. MS official policy statement:
Ballmer, in a statement, said he was "grateful for the many years of work that Steven has contributed to the company."
For his part, Sinofksy said he decided that, after more than two decades at Microsoft, and after shepherding the launch of Windows 8, it was time for a change.
"After more than 23 years working on a wide range of Microsoft products, I have decided to leave the company to seek new opportunities that build on these experiences," Sinofsky said in an e-mail to colleagues. "My passion for building products is as strong as ever and I look forward focusing my energy and creativity along similar lines."