Also, please be aware that ALL queues at Universal are fully accessible to guests in wheelchairs (except BTTF and Kong).
In other words, Assisted Access Passes are not handed out like candy and, typically, very very few guests actually get them. If your disability (without getting personal) only confines you to a wheelchair, than you will most likely NOT get an AAP. Many guests, if they do have trouble walking, will be given a comp wheelchair or ECV rather than an AAP to help them get around.
Typically, if the disability is not readily visible (severe autism, etc), guests are required to bring documentation from their doctor that the disability exists.
Like I said, don't need to get personal, but be prepared, based on your disability, that AAPs are not very easy to get due to the accessibility of the parks. If you were, in fact, promised one on the phone - might want to call guest services in advance and confirm it - plus get the names of the people you talked with.
Just don't want you to be dissappointed when you get there