That might be exaggerating somewhat, Java runs between your library of apps and Office but the actual store is HTML and XML based; on the other hand why you need an app store for office or what these apps will be is a bit of a mystery.  The Register also noticed a rather poorly thought out feature, your controls recede into the background when you are working on your document which can make finding the right button on the ribbon a more difficult task than it should be.  On the plus side the controls are more spaced out making it easier to use with the touchscreen input capabilities of Windows 8 and who wouldn't want to build an Excel spreadsheet from scratch using a touch screen keyboard?  This release also marks a serious effort by Microsoft to make Office applications mobile, not only for Surface but iOS and Android as well, so there is that.

"Fourteen revisions since the first Office that it may not be easy, because spell checking, grammar checking, wiggly underlines, paragraph styles and even Track Changes have been in Word since way back when.

With Office 2013 now officially available, is there anything in it actually worth upgrading for?"

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