See Tom Hogarty’s presentation starting 33 minutes into this recording of the Photoshop World keynote – see this Adobe demo of Lightroom synchronizing adjustments between computers via the cloud. It’s “the next evolution of Lightroom”.

As you’ll see, adjustments are passed between two devices – a laptop and an iPad – without the user needing to do anything. I’ve often seen people waste so much time copying xmp files around, and how little they are believe in the magical Export to Catalog / Import from Catalogue workflow, so you’ve got to welcome anything Adobe can do to improve the process of passing work between different devices. Presumably that synchronization is only going to be available via the Adobe Cloud.