The first motherboards for Intel's Kaby Lake processors are expected this Fall. Tom's Hardware had a chat with Colorful and heard the company plans to launch its Intel Z270 chipset based motherboards sometime in October. Although the company did mention that a delay is possible, if Intel decides to postpone the release of its Kaby Lake chipsets.
Kaby Lake sticks to the same LGA1151 socket as its predecessor, so these motherboards support Skylake processors, as well.
Kaby Lake should continue to use Intel’s LGA 1151 socket, which was introduced with Skylake. Because they use the same socket, all Kaby Lake chipsets should support Skylake processors, as well. This creates a market for Kaby Lake motherboards prior to the release of Kaby Lake processors, and could result in the boards showing up before the CPUs. Essentially the same thing occurred with Haswell and the Z97 Broadwell chipsets a few years ago.