Devices can start using the logo on January 1st, 2020.

The definition isn't a great stretch when early 8K TVs already meet the definition. This is, to a degree, a formality. It does set baseline expectations for what 8K TVs can do, though. You shouldn't have to worry that a given screen will fall short on key specs, and you could see more brands keen to tout 8K than they have been in 2019.