Someone should literally build a custom SFF case around that amazing MSI passive gt 1030 with hdmi 2.0 and DP 1.4.
Some half height + single slot love is needed.
edit: also one of these inside a NFC S4 would leave room for some creative stuff (internal AC-DC brick, fans, antennas, LEDs, a speaker, USB accessories and dongles, etc.)
Within a generation the output capabilities of these cards will be integrated in Intel next gen iGPUs, but those are still months away and above all these are upgradable. 4 years from now you can easily upgrade to an "HDMI 3.0" card for 60-70€.
35W CPU + ~30W fanless GPU + internal DC-DC + internal AC-DC all upgradable
vs
mini-STX 65W cpu only
or something like a NUC
The first solution is slightly bigger but fully upgradable.
People are hyped about MXM GPUs on mini-STX systems but I wonder what could be achievable if there was more interest in low profile single slot cards (also taking into consideration HBM memories and the smaller video I/O ports we have nowadays)