We knew that when he fired Scott Forstall.
Because Scott Forstall was bringing what to Apple exactly? What was his vision for the future of the company? He certainly didn't move iOS forward. Google maps blows Apple maps out of the water, Apple has nothing like Google Now and Microsoft's virtual assistant is able to interact with 3rd party apps but Siri isn't. Inter-app communication on iOS is basically non-existent as is actionable notifications. Forstall let iOS stagnate. Why would anyone want him back?