At Office Next blog today, Microsoft detailed the SkyDrive integration in upcoming Office 2013 suite. One of the main integration is that, SkyDrive is now the default location to save documents. Saving to the cloud offers anywhere access to content through the new Office. This allows users to move from device to device without having to worry where their content (or Office app) resides. Also with SkyDrive for Windows client, you can keep your documents in Sync across devices. Anywhere, you can access the document and even edit it with Office Web Apps.
Also Office 2013 will have a smart sync feature,
Using Office and SkyDrive to sync your files has great benefits for bandwidth utilization and battery life. For example, if you are working on a 50 MB PowerPoint presentation and decide to insert a new bullet point, Office will only upload that single bullet point. The same goes for downloading updates from the cloud. We call this partial file upload and partial file download and it’s enabled via the MS-FSSHTTP protocol.
Read more at Office 2013 blog.