Apple plans to market the current Apple Watch as a primary input device for the next-generation Apple TV, in addition to the “fancier” remote control that will be bundled with the new device, according to sources. In line with earlier reports, our sources indicate that the new Apple TV box will be unveiled in June with deep Siri integration and third-party application support. Our sources add that a new version of Xcode, known as “MuirTrail” internally, includes a new feature called “TVKit” for developers to build third-party Apple TV apps.
Source: Apple readies first significant Apple Watch updates, ’TVKit’ SDK for Apple TV | 9to5Mac