Is your league in the Fall Federation (i.e. Rancho Trabuco, Huntington Beach, Long Beach Heartwell, Laguna Niguel, East Whittier, Capo, La Habra, Aliso Viejo, San Clemente, Orange, Canyon, Newport Mesa, Brea, Mission Viejo, Irvine, Tustin, and Fountain Valley)?
If so, I always found it odd they advocated playing the same age group as the previous Spring instead of moving up like travel teams. They do allow up to 4 players to play up in the Fall and you can petition for more. They also have 2 levels of "select" teams, Gold and Silver, so all-star players could play either 10U Gold or 12U Silver. See their website, Fall Ball Federation, for more info.
A lot of 12U players move on to travel, so I doubt there will be many studs staying at 12U in the Fall.
Yes we are part of Fall Federation.
I had heard and understood that only 4 girls could play up like you mentioned. We have 3 All-star teams right now and we are anticipating our gold team is going TB. Between the 36 girls in our division their are only 7 first year 10's. So out of the remaining 29 girls minus any girls who go Travel only 4 can move up to 12U Select? The rest have to choose between 10U select or 12U regular rec ball? That's what I understand or was told but I haven't read the official rules yet. Its the parents who have to make this decision who keep coming up to me and ask if it's worth it or not.