During WWDC 2014, Apple executives talked about the new Photos App that they’d be launching for OS X. According to The Loop, Apple will soon discontinue further development on its professional photography App, Aperture. The Loop published its communication with Apple regarding this:
With the introduction of the new Photos app and iCloud Photo Library, enabling you to safely store all of your photos in iCloud and access them from anywhere, there will be no new development of Aperture. When Photos for OS X ships next year, users will be able to migrate their existing Aperture libraries to Photos for OS.
During the brief introduction of Photos App at WWDC, it was stated that the new App will combine with iCloud Photo Library and would replace both Aperture and iPhoto. Though iPhoto would provide all the basic functions related to photo, professional features that Aperture provides will be missed.
According to TechCrunch, Apple will provide compatibility updates that will allow Aperture to run on OS X Yosemite but further development on the App will stop. There is yet no information on discontinuation of iPhotos for iOS.