Finally! Microsoft just released Office Developer Tools for Visual Studio 2012. If you’re interested in go to download site.
To share your apps in the Office Store , you’ll need an Office 365 Developer Subscription. Unfortunately my BizSpark account hasn’t this benefit.
New MSDN benefit for subscribers of Visual Studio Premium and Ultimate with MSDN: a one-time 12-month Office 365 Developer Subscription. Eligible MSDN subscribers can activate this benefit today from their My Account page at http://msdn.microsoft.com/subscriptions/ (the benefit excludes MPN, DreamSpark, BizSpark, and WebsiteSpark subscriptions).