If you purchased a new television recently, there’s a better-than-good chance that it is a 4K Ultra HD set, as those have become the norm, and not the exception. One way to take advantage of the added resolution (over Full HD) is through select content on Netflix. Depending on the luck of the draw, however, you might be charged an added fee

Source: Hot Hardware – Netflix Tests Pricey Ultra Tier For 4K Streamers