Apple is working on a new Siri that will be able to control third-party apps, and is already testing with WhatsApp, Uber, etc.

Mark Gurman's latest Power On newsletter at Bloomberg contains interesting information about App Intents, an existing feature that Gurman says will get a big upgrade next spring when the new, smarter Siri launches. When this feature is live, users will be able to use their voices to give Siri complex, cross-app commands.

While public attention has focused on the postponed ability for Siri to pull personal information from messages, emails, and photos, the report says an upgraded “App Intents” system — enabling precise, voice-driven in-app control — could be the real breakthrough.