Sheet Metal Flat Pattern Calculation

I see on page 125 of the SW2011 What's New pdf that SolidWorks has revised the way it calculates flat patterns.

What were the old methods/equations used for calculating flat patterns?

What are the new methods/equations used for calculating flat patterns?

A detailed explanation of methods and equations used is what I wish to have documented between old and new.

Cheers,

Anna

SolidworksSolidworks 2011 Beta