Well, it's a few months away from release, so fortunately Apple's engineers will have a chance to fix some bugs that are already being reported by an anonymous tipster. Dave installed 4.0 on his iPhone 3GS and noted that the following items don't work properly:
- Can't change lock screen or home screen wallpapers. Settings gives him the choice and indicates the choice has been made, but nothing changes.
- Wallpaper can't even be picked on a 3G
- iTunes doesn't recognize folders and will not perform a backup, displaying an error message that the "backup failed because it was refused by the iPhone." It looks like a new iTunes version will be forthcoming. He also mentioned that folders are interesting, but limited to 12 apps per folder. If you have a lot of games, you'll end up with folders named "Games 1", "Games 2", "Games 3", etc...