According to the 18-19' join page & application
http://www.ussoccerda.com/overview-join-the-academy
"Girls' Applications*: New clubs can apply for full Academy at the following age groups: U-14, U-15, U-16/17 & U-18/19.
*The Girls' Development Academy is currently in the first year of the program. Academy Leadership is in the stage of observation and analysis about any potential age groups for expansion, e.g. U-13, U-16 single age, etc. If the Academy were to expand, all clubs that complete this application would also be considered for additional potential age groups and would receive communication prior to confirming participation. Note: Existing Academy Clubs do not need to apply for any potential expansion, they will automatically be considered for any additional age group expansion.
The combine U16/17 group seems like a step back but that's the status quo for now, maybe that will change but I would think they would have to change the boys groups also so I kind of doubt that at this point. I guess the final answer has to come by Feb or so during the confirming process.