Seems to be a strategic move to bring a girls component to complement the MLS Next program for boys, since ECNL has both boys and girls. Makes sense given the current soccer landscape, but likely is more form over substance...like most, so-called "elite" leagues.
I've actually been pleasantly surprised by the initial efforts and organization of the MLS Next program, although there is a long way to go. We shall see once we're actually able to play games.