Apple will completely rebuild Siri's architecture in iOS 19, merging its current dual-system approach (one for basic commands, another for advanced queries) into a unified "LLM Siri" architecture. This overhaul, expected to launch by spring 2026, will enable the delayed features like personal context and on-screen awareness, whilst significant leadership changes, including Mike Rockwell taking charge of Siri development, signal Apple's serious commitment to finally addressing Siri's longstanding issues.​​​​​​​​​​​​​​​​

https://9to5mac.com/2025/04/26/apple-fixing-siri-in-ios-19-heres-how/