Apple TV now lets viewers turn on sign language interpretation within supported titles, and Apple is presenting it as a built-in accessibility feature.
That is the confirmed extent of it: a new option the viewer controls, limited to titles that support it. Not yet specified are which titles qualify, which sign languages are covered, and how the interpreter appears on screen.
The name itself adds some ambiguity. "Apple TV" refers to the set-top box, to the app that runs on many devices, and to the streaming service. Which of those carries the feature has not been spelled out, so it is unclear whether it is tied to Apple's hardware or available wherever the app runs.
The feature matters because of what it adds to the usual toolkit. Captions and audio description are the familiar accessibility options on streaming services. Captions, though, are written text, and for viewers whose first language is a sign language they are a translation into a second one. Interpretation in sign language addresses that gap directly.
The details will decide how much that is worth. Sign languages are distinct from one another: American Sign Language and British Sign Language, for example, are not mutually intelligible. A feature that covers one language, or a handful of titles, serves a much narrower audience than the phrase "built-in" suggests. The first list of supported titles and languages will show whether this is a catalog-wide commitment or a starting point.