We have already said that the focus of iOS 9 (codenamed “Monarch”) will most likely be general optimizations and improvements. For, according to the sources of the 9to5Mac, the same thing will also be applied to OS X 10.11 (code-named “Gala”).
The idea is to present absolutely nothing new, but due to this focus on general improvements, some new features should be left for later. Among the novelties that can paint on iOS 9, we have a new typography (San Francisco, the same as the Apple Watch), new app "Home", apps running side by side on iPads and new features for maps. In OS X 10.11, we will have visual refinements, new typography (as in iOS 9) and the inclusion of a Control Center (which would move the controls that are now in the menu bar to this new area).
There are, however, more profound news that cover both iOS and OS X. One would be a new security system called "Rootless" (in literal translation, “No reason”). Such a system would completely change the current characteristics linked to kernel, preventing even administrative users from being able to access certain protected files.
People who had contact with this new system said that the "Rootless" be a hard blow to the community jailbreak on iOS; on OS X, on the other hand, the feature can be disabled. But even with the arrival of "Rootless", the Finder-based file management system continues to be used by Apple on OS X.
Still in terms of security, the information we store in the Notes, Reminders and Calendar apps, for example, is synchronized between devices using IMAP technology (regardless of whether you are using an iCloud, Gmail or Yahoo account). In iOS 9 / OS X 10.11, Apple intends to take IMAP out of the picture and synchronize with iCloud Drive, which offers greater speed and security (encryption throughout the process).
An application called iCloud Drive, so that we can view files stored in the cloud, is also in development. What is not clear, however, if it will be released by Apple or if it is being used only internally.
Apple would also be developing what they’re calling “Trusted Wi-Fi” (“Wi-Fi Confiveis”), which may arrive at the end of the year or perhaps only in 2016, with iOS 10 / OS X 10.12. The idea of the feature to allow Macs and iOS devices to connect to authorized wireless routers without needing any additional security measures; on the other hand, it would require an even more secure / encrypted connection to non-trusted routers.
To fans of the theory that Apple loves programmed obsolescence, sources said the company is working hard to make iOS 9 run very well on older devices like the first generation of the iPad mini and the iPhone 4s. For this, the company would be adopting a new development measure.
Instead of fully developing a feature for iOS 9 and then deciding whether a particular device can or cannot run that feature (primarily looking at its performance), Apple is now creating a specific version of iOS 9 that works from efficiently on older devices (with A5 processors), allowing all or most of the system's resources to work well.
Finally, Swift. Yes, Apple's new language should also gain new features. Apple does not yet include Swift's programming "code libraries" within iOS. Thus, developers who choose to write applications using the language must include these libraries within each of their apps, increasing their code and their size / weight.
Now Apple intends to change that, adding these libraries to the system and allowing developers to make their apps even lighter, with fewer codes. However, it will not be until 2015 that we will see Apple applications (both for iOS and OS X) being rewritten in Swift; according to the sources, this should be for 2016 (iOS 10 / OS X 10.12).