What’s new between office 2010 and office 2013?

Differences Between Office 2013 and Office 2010

Microsoft Office: which version should I buy?
http://www.theguardian.com/technology/askjack/2013/apr/25/microsoft-office-which-version-windows-8

Office 2013 vs. Office 2010: Compare and Contrast
http://blogs.gartner.com/guy-creese/2012/07/17/office-2013-vs-2010/

Have Office 2010? Don’t Buy Office 2013 – Here’s Why
http://www.makeuseof.com/tag/have-office-2010-dont-buy-office-2013-heres-why/