I can currently visit https://tv.xfinity.com/recordings and access my 20hr cloud based DVR that came with my XFINITY stream only plan ($18 a month).
I would love to have the ability to record shows straight from the DVR, that way I don't have to wait for other channels like FOX ondemand to let me record the show, since the XFINITY DVR records from live tv. Seems like it would be a worthwhile service.