Comments feature in Microsoft Office 2013

Microsoft unveiled the new Microsoft Office aka The Microsoft Office 2013 few hours ago. Of all the features I'm most impressed by the 'comments' feature. I think this will go beyond the regular 'review' feature offered in Microsoft word until now. You can now add specific comments and get responses on your comments right away - because the documents and comments are all saved in Microsoft's cloud service - Skydrive.

What do you think?