Scott says that the Olympics is being broadcast in 4K and HDR. There are three different options to view it:
1) On Demand from Comcast with the XFinity X1 Box
3) Dish Network.
The last two are live and coming directly from the Olympic Broadcast Service (OBS). Comcast or Dish are HDR10, while DirecTV is HLG. It's also on a 24-hour delay. No 4K streaming sources though in the US. Maybe in the rest of the world, but not in the US. What's cool is that in DirecTV, the audio is in Dolby Atmos.
Hulu isn't doing 4K streaming, but they are streaming at 60fps. That's really interesting, for sports. But Hulu's service went down during the last 2 minutes of the Super Bowl, so keep that in mind.
You can also view about 50 hours of VR programming. Check out Scott's article on AVS forum here: How to Watch the 2018 Winter Olympics.