We usually don't cover single board computers but since established brands are denying us fanless Gemini Lake motherboards with DC power and M.2 slot, meet ODROID-H2.
Powered by the desktop-grade Celeron J4105 (10W TDP) the NUC-sized barebone features an impressive heat sink and two SO-DIMM slots, four PCIe 2.0 lanes, two Gbit Ethernet ports, two SATA 3.0, HDMI 2.0 and DP 1.2 ports. A pretty fantastic offering. Available in November.
Source: ODROID
Update: Powerful enough to emulate the Wii.