This morning Apple previewed the next versions of OS X: named Yosemite and iOS 8. Changes to OS X include a redesign of the user interface. While I think that they finally got things consistent throughout Mavericks and so not what I would say would make it a high priority, it will provide the option of a light or dark look to the UI. One of the major new features is Continuity that will allow one to move from working with one iOS device or Mac to another.
Some features for the camera and photos app will be access to all photos on all devices, via an enhanced iCloud service. One will be able to search photos and new editing controls within the photos app. Third party developers will also be able to extend with their own filters. In addition a Photos app that will be coming to the Mac next year.
The new updates will be available in Fall and look like they will have much to offer.