The official marketing message is bring the "magic of iPad" to the desktop. Apple knows how to ride their own wave. The glossy pictures give Grandma the impression that the UIs will merge and everything will be better
because of the new interface changes.The substance behind this hype are the improvements toward ubiquitous computing. No single improvement is revolutionary. Auto Save and Versions means less worry about losing work. Google Spreadsheets has these. Resume is similar to Session Manager for Firefox. It is useful for single computers now, but will be even more handy when we move around between computers and resume from anywhere. AirDrop and even iPad File Sharing over WebDAV on Lion Server are efforts to integrate services like Dropbox into the core of the OS.
Management of these menial tasks and concerns fades to the background. Google is artful in bringing such improvements to their web apps, and Apple is beautifully skilled at integrating new functionality and paradigms into their devices and OS platforms.
So we have saving, versioning (of sorts), resuming, and sharing. All we need is a humongous data center to store all the data.
The writing is on the wall, just past the glossy pictures.