Skylake processors LGA 1151 in the new motherboards will also work. As is known, the memory controller in the Intel platforms built into the CPU, namely its ability to determine which memory can be installed on the motherboard.
And so, at Kaby Lake processors will not only be maintained compatibility with memory type DDR3L, but also support DDR4-2133 supplemented DDR4-2400 support. Accordingly, speaking about new DDR4 memory kits that are compatible with Kaby Lake, memory module manufacturers will refer mainly to DDR4-2400 kits and faster.
At the level of the chipset number of supported lines PCI Express 3.0 increase from the current 20 to 24 pieces. It is believed that the additional lines required to implement the support of solid state drives Intel Optane series of memory-type 3D XPoint. CPUs Kaby Lake in this sense does not evolve: they will still be able to share the PCI Express 3.0 16 lines by the formula "x8 + x8" or "x8 + x4 + x4".