The Self-Service Business Intelligence (BI) paradigm has be around since SQL Server 2008, and now SQL Server 2012 and Excel 2013 have provided even more enhancements and sweeteners for BI enthusiasts.

This article Understanding PowerPivot and PowerView in Excel 2013 (here) describes the changes and new features in PowerPivot and PowerView within Excel 2013. It also shows the difference in architecture between Excel 2010 and 2013 with respects to PowerPivot.