Formulas came with two sets of discs
 

Ok so I ordered some 2012 formulas on sale and they came with two sets of discs. One has the mounting slots offset from center, is that for people with big feet?

It's just for better adjustments. If your stance width doesn't land centered on one of the insert packs and you need to be able to slide the binding forward back for boot centering you can get both with the offset disc.