Apple already has deals with a handful of third-party services, such as Yelp, but those deals came from Apple working on a company-by-company basis. With an SDK, any developer would be able to integrate their app with Siri. According to the report, the app developers would be responsible for ensuring that Siri connected to their app when appropriate.
For instance, an app like Uber could gain integration with Siri, allowing users to request a car via Apple’s virtual assistant. How Apple’s beefed Siri is described is a lot like what the original Siri creators showed off with Viv earlier this month.
Apple hopes to make the Siri SDK available in time for WWDC in just a few weeks. At this point it’s unclear when the actual hardware device will be released. Apple is expected to bring Siri to the Mac at WWDC, as well.