Word is going around that Google poached Apple's John Bruno. He was the founder of Apple's silicon competitive analysis group, the team that's responsible for the SoCs that are used by the iPhone and iPad product lines. Until he joined Apple in mid-2012, Bruno worked on AMD's Fusion project and before that he designed GPUs at ATI.
SlashGear reports Bruno's LinkedIn profile reveals he joined Google this month as "System Architect":
Bruno’s LinkedIn page confirms he joined Google this month as a “System Architect,” so it’s unclear exactly what he’ll be doing, but it’s sure to be related to chip development. He is the latest in a line of several Apple engineers that have been poached by Google in the last year, including Manu Gulati, an eight-year Cupertino veteran who was critical in the development of the A-series chips.
It's also known that Google hired other Apple chip designers as well as Qualcomm engineers. Put one and one together and it appears that the search giant is working on its own mobile chip. Perhaps a future Pixel smartphone will be the first device to feature an in-house Google SoC.