I don't have info (didn't do the research) for prior to last year, but there is a big jump this year in freshmen AA's compared to 2011.
2011--6 AA's: #2,3,4,6,7,8
2012 (my unofficial count): 13 AA's #1,2,2,3,3,4,4,5,6,6,7,7,8 That makes a total of 7 AA's placing in the top 4!
Pretty impressive freshmen class--with many more losing in R12. Both Nebraska and Edinboro had some great freshmen that almost AA'ed and then you have Iowa's Evans too.
If anyone has older data on freshmen AA's I'd be interested for comparison's sake to this year's group of FR.