I'm still baffled why Apple doesn't have Photos ready to go for both platforms. It's pretty much useless to me until both OS X and iOS 8 versions are ready.
I'll guess I'll use it for photos I take when I get my 6+, but there's still no word how to get my current set of photos (going back to 2008) that I have on my desktop Mac to take advantage of the Photos app.
I guess we have to wait until 2015 for it to launch, but again, still no clear date on when exactly that is.
This forces me to keep managing my current photos the way that I am, AND managing my iOS 8 photos differently until the Mac version is out.
Thanks Apple.