In July 2012 Microsoft made a public preview of Office 2013 available for download.
If you go to http://www.microsoft.com/office/preview/en and sign up for the new Office 365 Home Premium subscription (free during this preview), you’ll be able to install Office 2013 Public Preview on up to five computers (devices). Microsoft uses Click-2-Run technology to install Office 2013 onto your computer, which means you can start using Word in two minutes. Setup finishes in the background. Read more about all the great features in Office 2013 at the “Office Next” blog. Se my screenshots below from the “streamed setup experience”. The Office Web Apps will also be updated and you can already use them in their preview form. Office 2013 only works on Windows 7 and 8.