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Microsoft has now quietly added the new version of Office 2013 to the Windows Store section of Windows 8 as a desktop app selection

From Neowin:
If you have a copy of Windows 8 and have been wondering if Microsoft would release the new version of Office 2013 as a desktop app in the Windows Store section, wonder no more: Microsoft Office 2013 has appeared in the Store just a few hours ago.

Of course, since Office 2013 is a desktop app, the section in the Windows Store is actually something of a placeholder. You still have to click on an URL which will open up IE10 that will then take you to the Office website where you can complete your purchase.
  Office 2013 now in the Windows 8 Store as a desktop app