Apple will introduce iOS 13 soon, because it will happen at the WWDC conference 2019 planned for early June. Until now, we could only guess what changes will be brought by the new version of the software for Apple's smartphones, but due to the large leak of information from a few hours ago, we can say quite a lot about Apple's plans for iOS 13.
iOS 13 is going to introduce a dark theme for the entire system, which design is planned to look similar to theme from macOS. The new system will also allow for opening several applications at once in smaller windows, and the overall navigation of the system will be easier with using new gestures. Changes will also apply to the application responsible for e-mails, as users will now be able to sort e-mails in various categories and mark messages that we can’t read at the moment, but we want to do it later. In addition, there will be changes in interfaces. Among other things, Apple will change design of menu responsible for volume control, which now will be smaller.