Welcome back, Lori!
I'm thrilled you will be returning to the Walt Disney World Resort soon. Yes, there have been some changes since your last visit in 2010.
Guests now receive a
Disability Assistance Service (DAS) Card that allows the recipient to obtain a return time to an attraction. Usually, the wait is ten minutes less than the posted wait time. You can request a DAS Card at any theme park Guest Relations Lobby. Be ready to discuss your son's specific needs so that the Cast Member can best assist him. The DAS registration process includes collecting some basic information such as your sons' name, your party size, length of your vacation and his photo. Your card will be printed right then and you will be all set.
Since it has been a few years since your last visit, I suggest looking at
Services for Guests with Cognitive Disabilities to help in your planning. You may also want to read this resource that Disney put together for families,
A Resource for Guests with Cognitive Disabilities including Autism Spectrum Disorder (ASD). I've found it's full of planning strategies, transportation information, detailed attraction information and much more.
I hope this helps to answer your questions about the DAS Card. Please let me know if you have other questions. I'm happy to help!
Missy