If it's just an app, I guess there won't be much integration with OSX and web clients ? e.g. a way to integrate a massive amount of already existing photos that won't be on the phone. Or add the new photos taken from time to time with a DSLR, or integrate with Lightroom or other photo management applications.

While thre's not much details available, it brings a lot of (perhaps undue) sceptism from the start.