1. Business Rules showing for Default Settings run first (in the order we choose to place them.)
2. Then, each Site in Alpha order runs it's Rules (with the ability to sort run order within each site.)

Please confirm

I also noticed during upgrade a complete set of Business Rules now exists at the Default Settings level, as well as within each and every Site. I diiscovered this by editing a Rule under Default Settings and it not working. I edited the same Rule under Site and viola! 

Regards,

Shawn