Three AAC teams were crammed into one region - that's a power move, right there.
Just a small correction on this point - there was a seeding rule change that has basically led more teams from the same conference being in the same region.
Two of the most interesting rule changes:
Rematches: Teams who've played only once during the regular season may face one another at the earliest in the Round of 32. The Sweet 16 if teams have played twice, and the Elite 8 if 3 times. Each of these "earliest rounds" are up a round from last year and previous years.
Splitting teams into different regions: The Top 4 of each conference do not need be split amongst 4 regions unless the teams fall within a 1-4 seed.