It will be very difficult for AMD's 2016+ K12/x86 equivalent to go up against Skylake, let alone Cannonlake. Intel's manufacturing lead is formidable, its cost structure is much better (which allows it to more profitably put in more features/performance), and its physical design teams are simply larger/more capable.
Look at the damage that Bay Trail-M is doing to AMD's computing solutions group...the chip that so many have mocked is winning almost all of the attractive low-cost notebook sockets. And, no, there's no "contra-revenue" here -- these are extremely profitable for Intel.
Once Intel moves to Braswell with Gen 8 GPU + 14nm + a focus on lowering system BoM, it really will be more or less lights out for AMD across the spectrum of PCs. And while AMD will hype K12 until it is blue in the face all throughout 2015 (AMD is doing the NVIDIA project denver thing..."high performance ARM core"), it ultimately won't save them.
AMD's best bet is to more or less put all of its energies into becoming an NVIDIA competitor. Semi-custom + dGPU should serve the business well, but any hopes that AMD will -- in an environment where Intel, Apple, Qualcomm, etc. all have soaked up the best engineers -- regain former glory is just misguided at best.