Full article here.Originally Posted by Microsoft
Microsoft Office 2013 is complete and the guys at Redmond are planning to release it for consumers in the first quarter of 2013, most likely in January. Also from October 19, customers purchasing Office 2010 will get the new Office for free upon availability. Microsoft will also release a preview version of the new Office on Windows RT devices, beginning with the Windows 8 launch on October 26.
Business customers and various owners of subscriptions, read the full article (link provided above) for availability in your programs.