What’s this? Microsoft Office 15 hasn’t even entered official testing yet! Too bad, because the internet is here to spoil Microsoft’s secret party by throwing back the covers on the future of office productivity much earlier than anticipated. Leaked by those sneaky Ruskies over at Winreview.ru, the follow-up to Microsoft Office 2010 they’ve managed to poach is obviously an early build, but does show off a few things prospective buyers might be interested in seeing.

The new software continues its love-affair with the Fluent User Interface (or the ‘Ribbon’, if you prefer), but the GUI has moved away from Aero themes and now tends more towards Metro, the GUI found in Windows Phone 7, the recently-scrapped Zune, and, indeed, Microsoft’s new test homepage.

Elsewhere, Powerpoint showed off a vastly reimagined set of new presentational templates, effects, and transitions. Outlook has been updated with more efficient file-sorting capabilities and new calendar layouts. Word is Word. Excel failed to work entirely; problems with its templates and a partially complete .NET Framework 4 integration.