Arte have started testing some FTA UHD HDR content on 19.2e today on 11778 MHz (vertical, SR 27500, FEC 9/10, QPSK)
They're coming in fine on my HD51 and triggering HDR on my TV.
The two channels are:
ARTEUHD1_HDR - UHD HDR
ARTEUHD2 - UHD SDR
It's the same programming currently, just one in HDR and the other in SDR.