The new Lists API methods have been added to API::REST. That's where Twitter lists the documentation for them, and they use the same base URI. For backwards compatibility, the api methods in API::Lists have been renamed legacy_* and they override the new methods. So, user code that includes the API::Lists trait will continue to run using the old semantics and end-points. To use the new Lists API methods, users just need to drop the API::Lists trait and use the API::REST trait instead.