From the point of view of mobile users, the big news is that Google is now fully supporting the integration of Drive into any Android and iOS app. Google software engineer Mike Procopio said:
That means that apps like Aviary, or Instagram, that wish to integrate Drive can now make it so that no extra storage is used up on your phone or tablet, while still being able to edit a file (or apply sepia tone files) to a cached image that will be saved to Drive rather than your internal flash storage. Of course app makers will have to enable these capabilities for you to enjoy them, but given the advantages for sharing and collaboration, not to mention mobile devices that lack expandable storage.
We will probably hear more about Google Drive for mobile at today’s keynote, but at least we know that more robust mobile usage is coming.
source: Google via Droid-Life