Wow. Things have gotten a little crazy in here.
Thank you to those that have provided information and encouragement. It is my plan to contact the school, and I have read everything they have available on their website, so I was looking for some insight from those that might know more from real world experience so I would know how to best approach the school.
To clarify some points - as far as I could tell from reading their website, it seems that it is not uncommon for students, especially entering K or 1st to not be fluent in ASL. While my son is not fluent by any means, he is willing to learn. If he wasn't, or if I thought he or we would have trouble learning ASL, then I would not consider sending him to an ASL school since they say all instruction is done in ASL with speech breakouts. I did read about the "probation period" and I did not know what that entailed. Thank you to the poster that clarified that. It does not seem quite so scary when put that way (making sure they are able to learn ASL).
What makes this the hardest is trying to figure this all out from another state. What I do know is that the public schools in the area we are moving to are awful (West Contra Costa Unified School District). So, we are pretty much looking at CSD or private school, which adds a whole other layer since private schools are not required to accomodate my son in any way shape or form.
As for AP classes, I will cross that bridge when I come to it. Right now I'm worried about Kindergarten.
But, I hope that my son will qualify for AP, and if that is the case then I will make it happen. I'm not as worried about the higher grades where he can help make these decisions for himself. Right now, I have to make these decisions for him, and I would hate for him to get up to the high school level and falter and then ask why I didn't send him to CSD and have to tell him I never tried.
I don't know if I'm going to put this right. The world is set up to welcome him as an oral communicator with open arms. There is no struggle there. In order to give him the best foundation to be as confident and independent as possible, I think it is my job to help him discover the less obvious options that might help him navigate this world.
Best case scenario? He goes to CSD, learns ASL, is able to gain acceptance into an awesome community, has no further deterioration and is now bilingual and can comfortably live in both worlds.
Worst case scenario? He goes to CSD, learns ASL, is able to gain acceptance into an awesome community, and either his hearing does deteriorate, or he becomes self conscious about his voice quality issues and chooses to communicate using only ASL.
Personally, I can live with either scenario, and I want him to be prepared for both. Because the true worst case scenario is that the latter happens and he is not prepared.
Stepping away from the rant now.
Anyhow, thank you to all of you that have posted. I will update you when I know more.