When I'm away on photo trips I use my iPad as both backup storage but I can also edit my images using Photosmith, which automatically syncs back with Lr when you hook the iPad to the computer.
This is just Adobe's own version of being able to do that, allowing you to edit images while you're on the go negating the huge amount of time that's required after your return from photographic safari when you have to go through thousands of images.
Granted, if you don't do many long photo trips away from home it may just be a bit of a waste of time for you, likewise if you don't have any of the Creative Cloud subscriptions that Adobe would like you to purchase, but I do see a point in this, even if it is just limited in scope.
Mark