That ATSC 3.0 version of the HDHR has been shipping for a while, at least for early funders of it. I don't think it actually has a DVR, it is just a tuner that connects into your LAN, but you can use this with a PC to record channels, or you can use the HDHR app to watch content on devices like phones, tablets, Rokus, etc. Silicon Dust has a specific sub-forum for ATSC3.0.
ATSC 3.0 Forum - Silicondust
I am a user of SageTV and SageTV should be possible to record shows using this tuner. Playing back the content is another issue but you may be able to use devices like a Nvidia Shield or other AndroidTV devices to run the AmdroidTV version of the SageTV miniclient. Or a PC with a video card that is capable of playing back 4K connected to a 4K TV.
There appears to be at least one Detroit station broadcasting in ATSC 3.0 so Canadians in Southwestern Ontario should be able to pick it up. And apparently some of the Buffalo stations are now live so much of the golden horseshoe area should also be able to tune in the channels:
ATSC 3.0 Buffalo NY Feed Issue? - Silicondust