Skylake processors lost integrated voltage regulator, which has taken root in their two predecessors (Haswell and Broadwell), for reducing energy consumption - the conditions dictated the tablet segment, where Skylake processor is nominally present.
According to the Italian site Bits & Chips, citing its own sources, integrated voltage regulators will return only with Cannonlake processors, preparing for announcement in 2017. Obviously, the transition to 10-nm process technology will play an important role in changing the layout - energy consumption is expected to decline.
Most likely, the overclocking potential of processors Cannonlake existence of an integrated voltage regulator will affect negatively.