Id like to see:
1. A goto date... function in the calendar.
2. Scroll down to bring in the search screen from anywhere on the springboard, and have sidewards scrolling cycle screens endlessly.
3. Ad blocking in safari.
4. Password protect the removal of apps so holding the home button brings up a password entry box...
5. A user folder that can be mounted on the desktop and shared by all the iphone apps (a la iPad?). This would make the search function more useful too.
6. More functions on the lock screen as previously mentioned.
7. Ability to select a 3d dock... maybe.
8. Folders on the springboard.
9. Splitting the ipod app into videos and music like on the ipod or at least an option for it.
10. Landscape home screen.
11. Rotation lock that applies to all apps.
12. Ability to make, name and delete playlists in iPod app.
13. The ability to delete songs / podcasts in the iPod app.
14. The weather app automatically detecting your location.
15. Not being thrown out of the app store when I download an app. Grr.
16. The ability to add folders to any email account in the email app and smart folders.
17. Notification of podcast updates and downloading them within the ipod app.
I also think IR in future models would be good but only if they included an app that worked as a multifunctional remote control.