last year they took the top 4 teams from each region. the teams were broken into lower and upperstate groups/brackets. a couple of the top ranked teams get a first round by. then the top ranked teams left play the lowest ranked teams (#3 playing #10, #4 playing #9, for example). higher ranked team got home field. i'm not sure how they got the ranks once the regions were combined. and i'm not sure exactly how it was but thats what i remember. also, it might have changed for this year.