"Sony plans to make the department responsible for the Walkman brand a separate subsidiary in October. This would likely be followed by the spin-off of the device division including image sensors in the future, according to Kazuo Hirai, [Sony] chief executive."
Update: EETimes too quotes FT article on the image sensor business spin-off.
Update #2: Nikkei quotes Sony CEO intending to spin-off most businesses and keep the HQ small:
"We will spin off businesses that are currently run by the main body one by one," Hirai said. "(By leaving only departments related to management, R&D, etc to the main body), we will make small headquarters to increase the speed of making management strategies and decisions."
