A subset of Apple's software engineers started internal development of iOS 19.4 last month, according to the MacRumors visitor logs. iOS 19.4...
www.macrumors.com
This is a good example to illustrate how out of touch iOS 19 rumors are currently, never mind Apple never intends for iOS/iPadOS to mimic MacOS except in restricted ways. Stage Manger is just basic functionality on macOS but for iPads it’s the only upgrade feature over the barebones multitasking capabilities but that’s as far as it will be tinkered with. Apple as future goals intends to make Siri powered by AI the next multitasking implementation against what iOS/iPadOS. Think knowledge navigator, a small device that allows human interaction beyond display limitations compared to the traditional UI of computer which offers much more variety of interaction, control, and devices to used simultaneously.
What a joke these rumors are currently using the 18.4 Siri implementation rumors with this old thought that some how things will be similar released version. If anything the new Siri be part of the developer release. You ask how can that happen it’s because it requires the new OS framework, not able to achieved in the current OS framework, the last 3 point releases demonstrated that particularly with month+ delay. Look WWDC has to be about improving the user interface appearances to simplify ease of performing specific operations organization as well as give iOS/iPadOS updates to applications by Apple now bundled.