"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," an Apple spokesperson told TechCrunch. "When Photos for OS X ships next year, users will be able to migrate their existing Aperture libraries to Photos for OS X."
Apple says that it will provide compatibility updates to Aperture that allow it to run on OS X Yosemite, but will not continue to develop it. In addition, it is working with Adobe to work on a transitionary workflow for users moving to Lightroom.
If your workflow depends on Aperture, you might want to start planning for its demise.