Though OneDrive for Business is in constant evolution, this recorded session goes over what it is and how it should be used. You should definitely keep an eye out on the sessions coming to Channel 9 after Ignite as OneDrive for Business is changing both in UI and in features. For example, you can now copy files from your OneDrive to a SharePoint Team Site. Pretty cool!
Here is a blog to find out more: What is OneDrive for Business