I definitely think you should contact the school counselor. In our district, the clock on the IEP process starts with the formal request to the counselor. I would ask the person you saw at KKI to write a letter to the school outlining his diagnoses and requesting accommodations for him. I would attach that to the request. You need to do this now before the school year starts winding down. Which may seem off, but once the third quarter is over, things slow to a huge crawl at many schools.
But even if the counselor is not the one who starts the IEP process in your district (and they will know who does if they are not), you can enlist their aid in helping your son acclimate. They can arrange a tour of the school over the summer. They can put him in a lunch bunch in the fall for new kids. They can keep an eye on him and let you know how he is adjusting. They can tell you what accommodations are typically given for kids with his diagnoses.
So the earlier and sooner you start that dialogue with the school, the more they can help him adjust and give you good ideas.
Beth, mom to older DD (8/01) and younger DD (10/06) and always missing Leah (4/22 - 5/1/05)