L.C.
Hi R.,
I just saw your post. My best friend's son has Aspergers. He 13, brilliant and does great in school. His problems have been "social" and he has a hard time making friends. He was diagnosed at around 5 years old and when he turned 10 they told him he had aspergers and it helped him understand his behavior better.
I would definitely get the IEP because you need it to make sure your son gets the help he needs in school. There is no need for other kids/parents to know but it helps that the teachers know. My friend has only had problems occasionally with certain teachers who refused to be flexible in the way they taught her son.
Hope this helps! Good luck! The earlier you intervene the better it will be for your son.