(Aperture and iPhoto libraries are already compatible, and have been shareable since versions 3.3 and 9.3 respectively.) Likewise, if you use iPhoto, you'll be able to migrate your library over to the new Photos app as well. All the non-destructuve edits you've applied to your Aperture photos will be preserved in Photos, and preserved non-destructively. When you migrate, all your albums, folders, keywords, and captions will move from Aperture to Photos. Come early next year, you'll be able to migrate your existing Aperture library to the new Photos app for Mac.
