I finally got my new Odroid SBC and have migrated all the services from my Odriud XU4 over to the new HC1. The HC1 is based on the XU4 but drops multimedia interfaces like the HDMI port and instead adds a SATA connector and the black aluminium case fits a 2.5″ hard drive. The case is stackable and acts as a passive cooling heat sink. Since the HC1 is based on the XU4, software that runs on a XU4 will run on a HC1 without any fiddling.
It doesn’t have an eMMC connector, but you can assign the / partition to the hard drive/SSD, only the /boot partition needs to be on the SD Card.