Intel's Ghost Canyon X will be an absolute beast. The system will be powered by a 45W Coffee Lake HR processor, up to 8-core / 16-thread. Also onboard are three HDMI 2.0 ports, two Thunderbolt 3 ports, M.2 storage, and a PCIe x16 slot for a discrete graphics card.
The 5-liter chassis looks clean and elegant, but is subject to change. Ghost Canyon X is not expected until early 2020.
The system will almost certainly be actively cooled, although a third-party fanless case is always a possibility. Akasa Galactico did wonders with the 45W Skull Canyon NUC.
