Over at AVSForum, Scott has an article on how to watch the World Cup in 4K HDR. You basically need to either be a Comcast subscriber with the Infinity X1 service, or be a DirecTV subscriber. For Comcast, it will also be a one day delay, and in Spanish! Leo says that makes it useless in today's world. Layer 3, owned by T-Mobile also has coverage.
Streaming online, you can get the World Cup if you have a HiSense TV. There's an app for it that you can install.