Comment 1 for bug 991459

Yes, it would be great to allow people to migrate easily from Mac OS. Importing photos from iPhoto and Aperture is probably not too hard. Importing edits and metadata might be harder since it's not clear that these programs store data in any publicly documented format.

I've created tickets for this feature request upstream:

http://redmine.yorba.org/issues/5158
http://redmine.yorba.org/issues/5159