I am really excited about where we are taking Office 2013. One of the most interesting pieces of it in my opinion is going to be Skydrive Pro.
If you have not used our consumer version of Skydrive, with 7GB of free storage, it is time to take a look. The Skydrive client software adds a Skydrive virtual folder directly to the Windows Explorer menu and keeps the content you put there synched between your PC and the cloud, so it is available to you anywhere from a PC, web browser, or mobile device, and can be shared at your discretion with anyone you like.
Skydrive Pro in Office 2013 leverages SharePoint (either on premise or in the cloud) to provide secure and synchronized storage and sharing for your business documents. Our SharePoint team put together a really good post on Skydrive Pro at http://sharepoint.microsoft.com/blog/Pages/BlogPost.aspx?pID=1015 and another good one covering where we are taking MySites here: http://sharepoint.microsoft.com/blog/Pages/BlogPost.aspx?pID=1014