If you read the LR5 announcement, then you'll find that LR5 uses a unique scaled-down version of the original RAWs (which are themselves still RAWs) to allow for offline editing on devices with little memory (in the context of the full LR5: laptops with SSD permanent storage). Allegedly, those mini-RAWs use only 1/10th of the space of the original RAW
But the RAWs in your camera will still be the same 30 MB, right? In order to scale them down we'll still need an old good comp with LR? Then why would I use this cloud service, if I can do it all much better and easier on my MacBook? And if I'll have any kind of connection while own the road, I'll better send the edited pics right from my MacBook.
Unless I'm missing something big.
Not that I'm against a new app / service, I'm just not getting its purpose.