Vision Pro goes international
Apple apparently doesn't plan to introduce any hardware at the show, but I'm not sure about that; I clearly remember hearing that before, only to be surprised by a new Mac. What I do think is coming is an expansion into international availability for Vision Pro, which is something needed by developers hoping to work on the platform. Currently, developers cannot obtain these devices outside the US.
Software updates
Apple will present updated versions of all its operating systems, iOS, macOS, iPadOS and all others. These will include simplified Settings/System Preferences apps and more customization options on the home screen, while most of Apple's existing apps will be complemented with AI features. Photos could get AI-based editing tools, similar to Smart Eraser on the Pixel. This could also extend to the Health app, which can improve by making active recommendations to Fitness+ subscribers.
And maybe, just maybe, Siri on the HomePod will get a little better at differentiating between Neubaten and Parton.