Can I apply geotags?
When you import image that have been geotagged (by your camera or manually) those tags will be respected. In Photos they will appear in the image's Info window along with an accompanying map. Photos will still recognize geotags that are assigned to new images by your camera, however, it appears that you can no longer manually assign geotags to images.
Can I use AppleScripts with Photos?
You will be able to use scripts with Photos, but the scripting dictionary isn't quite as robust as iPhotos, and many iPhoto scripts will not work. There appears to be no support for Photos in Automator (but that may change).
Are there any Photos plug-ins available?
Apple has said that Photos will be open to third-party extensions, but as yet we have seen none. We hope that some third parties will be able to address the lack of professional features in Photos for Mac.
Will Photos for Mac recall faces I have previously identified?
Faces metadata will also transfer over from iPhoto. When you import your Aperture (and iPhoto) library Photos will also import your face identification information and you will be able to select Faces and see the faces you have already tagged.
Will I still be able to use iPhoto?
If you like, you can still launch iPhoto and work with your images there - with the understanding that any edits you apply will appear only within the app you used to apply them.
Are all the editing features of iPhoto in Photos?
Advanced image editors such as Photoshop, Photoshop Elements, Lightroom, and Aperture let you perform a Levels adjustment to Raw images. You could do the same thing in iPhoto using the Adjust panel's histogram. Unfortunately there is no equivalent in Photos.
Will Aperture ever be replaced?
Photos is not an Aperture replacement. It doesn't offer Aperture's organizational powers, brushes, versions, and so on.
What it does offer is a number of photo editing features for free. If you want an app that offers more you will have to pay for it.
The best advice to Aperture users is to move to Lightroom. Here's how to move your photo library from Aperture to Lightroom.
Sign up for MIS Asia eNewsletters.