This may also be the groundwork for Apple's rumored Tile-like tracking tag, although there is nothing strictly linked to trackers in the leak.
Siri would support a host of new intents for third-party apps, such as media controls (for third-party services on the HomePod, perhaps?), Search, voice calling and travel information. There is also talk of a "brand new" framework for augmented reality, including an app that allows creating AR experiences visually instead of through raw code. Developers could make better use of the Taptic Engine in newer Apple devices, and Marzipan (Apple's iOS-to-Mac app framework) would use developers Mac-specific features like the menu bar and multiple windows. unknowns about Apple's intentions for iOS and macOS at WWDC, including the possibility of major interface overhauls. Hardware news, if any, is a mystery as well. If the sources are on the market, though, there will be some genuinely functional improvements that might not be flashy, but could have a far reaching impact on how you use your devices.