Apple's Worldwide Developers Conference (WWDC) starts this Monday, June 3, with a stage presentation by Apple executives at 10am Pacific Time. WWDC is usually one of the two biggest Apple events of the year (the other is the now-recurring iPhone / Apple Watch event in the fall), and it generally focuses on software.
It has become tradition for Apple to introduce new versions of its operating systems to developers at WWDC. Those systems include iOS for iPhone, iPad, and iPod; macOS for Mac; watchOS for Apple Watch; and tvOS for Apple TV and Apple TV 4K. In fact, these are some of the primary purposes of the event. So you can expect to see detailed presentations during Apple's keynote on each of those, plus deeper dives for developers in the various sessions at the convention center, which will also be made available as videos on Apple's developer portal.
To prepare for the event, we're recording what we want to be-true-true rumors, reports, and predictions ahead of the show — not just for software, but for hardware too.
Let's get in.
We'll start with iOS. Much of what we know about iOS 13 comes from a recent Bloomberg report, as well as a handful of leaks shared by 9to5Mac in recent weeks. Apple focused iOS 12 on fixing bugs and improving performance on older devices, with the company postponing some features to iOS 13. It's likely iPhone and iPad users will finally see some of the features they didn't get last year, but performance and stability remain a focus.
With those priorities in mind, Apple has, in fact, made some big changes to how it approaches developing iOS over the past year or two. We don't know much about how performance will be improved, though. The Bloomberg report says there will be new, perhaps faster animations for the multitasking interface and for closing apps.
When it comes to new features, though, we know a little more
We've seen multiple reports of reliable sources that Apple will bring to Dark Mode — which was introduced to MacOS with last year's 10.14 Mojave update — to iOS devices. Just this week, 9to5Mac published what it believes to be screenshots of Dark Mode (pictured above). It's a boon for users who find themselves using their phones in bed late at night or while watching a movie or TV in their home theater, for sure, but glare on those glossy screens will mean you'll probably want to keep the standard light fashion
While we don't have many details, multiple reports have said that the iPad will have a new multitasking interface and that there will be long-asked-for changes to the home screen as well. Further, Apple plans to introduce users to easily cycle between different versions of the same application, although it is unclear what the benefit of this would be to mainstream users. (Obviously, developers and some users could benefit from this tremendously.)
A 9to5Mac report also citing sources familiar with Apple's plans said some of new windowed application interfaces will be introduced – this may be the same thing as the Bloomberg reports note on multitasking, or it could be something else. In any case, according to 9to5Mac, "Each window will also be able to contain sheets that are initially attached to the screen but can be detached with a drag gesture, becoming a card that can be moved around freely." Users will be able to stack the cards or dismiss them with some sort of gesture.
Finally, the sources behind the same 9to5Mac report that Safari on the iPad will start defaulting to the desktop version of websites instead of the mobile version whenever possible.
Tweaks to existing apps that are made by Apple and included with the OS are expected with each new iOS release. Apple is designed to make notable changes to Mail, Health, Messages, Maps, Books, and particularly Reminders.
For example, the Bloomberg report says that Apple will make it easier to access and track saved locations in Maps. The report also says that users will be able to find threads in Mail, the Health app will display new and different information on their main screen, and Reminders will get a much-needed total overhaul.  Safari usually sees some big changes; this time, it will have that Apple will launch a new downloads interface — at least on iPad.
Other iOS changes
The Bloomberg report also indicates that Apple will introduce a SwiftKey-like swipe keyboard. These have been available as third-party apps for quite some time, but any platform holds with an abundance of resources, Apple has generally not been involved with under developers with its own first-party version of a concept popularized by the developer community in the fits.
Finally, Apple reportedly plans to introduce several new parent-focused features for Screen Time, the Settings panel that came out last year. Screen Time allows users to control what apps and content can be accessed when, as well as track their usage with helpful metrics.