Kaby Lake will add native USB 3.1 support, whereas Skylake motherboards require a 3rd-party add-on chip in order to provide USB 3.1 ports. It will also feature a new graphics architecture to improve performance in 3D graphics and 4K video playback. Kaby Lake will add native HDCP 2.2 support. Kaby Lake will add full fixed function HEVC Main10/10bit and VP9 10bit hardware decoding. Kaby Lake will have an integrated memory controller that supports both DDR4 (2400 MHz) and DDR3 (1600 MHz) memory. It looks like Kaby Lake will be more of the same, slightly better in energy efficiency, though it has to be stated - the processor listed would be an engineering sample. Intel will release Kaby lake in the 2nd half of 2016.
http://www.guru3d.com/news-story/int...ppearance.html