Yep, that is YUGE!
I watched the Keynote, and all the stuff that has been talked about is there.
Two parts
1. AI aka Apple Intelligence, private operations and interoperations between all Apple devices and abilities based on personal data, no one else able to access.
2. ChatGPT integration for complex operations with cloud servers, of course asking permission from the user to do so every time.
Stock wise it will cause a rise as there will be a major upgrade cycle to devices that have the right chips to support such capabilities, first one being the iPhone where only the current IPhone 15 Pro and Pro Max are compatible.
All of that coming this fall, including the iPhone 16.