Key Question: If Apple is going to be in the forefront of SoC development and provide its own chips for Smartphones, Tablets, Two-fers, and Macs -- and push Intel to insignificance in the process - why do you think top SoC/GPU designers leaving Apple...?
(They are going to AMD for god knows what, but that is another story...)
Last year AMD announced it re-hired one of the folks who eventually landed at Apple: CPU architect Jim Keller. Keller was responsible for one of the more memorable AMD CPU architectures, as well as played an unknown role in the development of Apple’s own CPU roadmap (Keller likely had a hand in the planning for Swift).
Today, word of another major hire surfaced earlier than expected: Raja Koduri now works at AMD once again. For the past 4 years Raja has been working on all things graphics at Apple, but now thanks to a great offer and a fear of getting too comfortable at Apple, he's back at AMD.