The latest iOS 8 leak is out by means of a list containing some of the refinements and tweaks planned by Apple for the next major revision of its mobile operating system. Focus areas include Notification Center, inter-app communication, Voice Memos, Messages, Game Center, and CarPlay.

Notification Center is one of the major elements Apple is looking into for some imminent changes. The sources said the translucent drop-down menu for managing alerts “may be simplified,” and that Apple is considering reducing some views from the panel to only include “Today” and “Notifications.”

Apparently there’s a bit of uncertainty regarding the inclusion of these tweaks in the first builds of iOS 8.

Apple is planning to implement an “XPC” service to enable apps to communicate better with one another and share data: “For example, a future photo editing application could have the ability to push the edited content for upload via the Instagram or Facebook apps.”

The feature was initially planned for iOS 7, but somehow it never made it inside the OS. Apple could just as well delay it again, the sources said.

The Voice Memos app will be enhanced so that its controls become more visible. The confusing interface will be tweaked so that people can understand better what buttons to tap to perform a certain action.

Game Center will be removed as an individual app, but not as a service. Gamers will sill be able to access the interface in games that are made for Game Center. CarPlay will be usable both with a Lightning cable and over WiFi when iOS 8 debuts.

The leak also includes information about the general functionality of the operating system, and how Apple plans to enhance its performance and run faster than iOS 7.

“In addition to the in-app tweaks, Apple has been working to speed up iOS 8 in comparison to iOS 7. Applications are said to launch more quickly, close more quickly, and overall system navigation is said to feel much smoother and more stable. Apple sped up animations and improved stability in the recent release of iOS 7.1, but the enhancements in iOS 8 are said to go a bit further.”

A lot of changes are expected to go down before Apple unveils iOS 8 at its annual Worldwide Developers Conference this summer. iOS 8 is also likely to drop support for some old-generation hardware, like the iPhone 4.