The consumer Broadwell-equipped NUC board kits will come in Core i5 and Core i3 variants, both based on the Rock Canyon design. Rock Canyon promises support for both 2.5" SATA and M.2 solid-state storage devices replacing the existing mSATA connectivity, built-in and non-optional Wi-Fi and Bluetooth connectivity.
I hope the built-in and non-optional Wi-Fi is incorrect. I hard wire everything. Have no use for Wi-Fi.