Designed for the fourth and fifth-generation Apple TV models, the new tvOS 11.4.1 developer beta can be downloaded onto the Apple TV via a profile that's installed using Xcode.
We're not yet sure what fixes and changes the tvOS 11.4.1 update might bring, but it's likely to focus on bugs that have been discovered since the release of tvOS 11.4.
Apple's tvOS updates have historically been minor in scale, and Apple does not often provide us with detailed notes outlining what's new. We'll update this post should anything be found in the beta.
Apple's work on tvOS 11 is winding down as the company is now focusing on tvOS 12, which is set to be unveiled at the Worldwide Developers Conference next week.