In reply to Indy:
There still hasn't been any full detail of the Photo package other than it will be able to take in your Aperture libraries and utilise 3rd part apps (I use Silver eFex a lot, would be surprised if there isn't NIK compatibility). At the moment Aperture still works so I'll be sitting there until I can see what Photo does (which will be bundled free with Yosemite) before investing time and money on Lightroom. It may be I go down the route of handing off to Iridient for my RAW processing from Photo, will decide in due course but I'm not panicing yet.