I noticed on the Ultra HD Sampler app that the different shows and episodes have had the links to commercials changed.
Episodes I watched before now show ads for Rio Olympics using the X1 Box. The listings cover each separate event on a given day. I would take it to mean the events will be shown (maybe live, or delayed) in: 1080i, 720p, or 480p. Maybe in 1080p (Blu-ray) but certainly not 4320p (UHD 4K).