You heard a lot or marketing and wishful thinking.
http://usclubsoccer.org/2016/02/24/us-club-soccer-statement-on-u-s-soccer-girls-development-academy/
USSF runs DA , US club soccer (member association) is behind the prep academy concept some refer to as DA II but they are different org all together (different registration, guidelines, etc you can't just easily move players between the two for example)
US club wants to get a bigger footprint in SC and try to appeal to other players or clubs that maybe looking at options outside of usys /cal south or other leagues.
DA is a framework: 10 month program, 30 games + showcases & playoffs, 3-4x training a week, no HS play, player mandates, no outside comp, etc.
US club soccer wants to pick or choose what suites them from the framework and call it something its not. One of the reasons you don't see any real actual info posted anywhere on either of those org sites about a new league, clubs have tried to put there own spin on this or claim this or that but so far no go.
There is around 8 clubs interested in this new prep league so they can market something to players that may look elsewhere for higher level play but the deadlines are approach for SCDSL and CSL league apps so don't be surprised if these 2nd or 3rd prep teams actually end up back there.
Until you see real info posted this new league is no more than marketing