Re: kids and moving
Yes moving out from an established circle of friends is extremely a life changing moment.
However, you can try and help your son - by taking him to the new school for a tour. Take him there - meet the principal, let the principal show him the class he will be in. You VISIT the class WITH him - just stop by to say hello to teacher and kids in that class. When you leave let the kids know you will throw a PIZZA PARTY and have CUPCAKES the day your son joins in the class. They will look forward to this. Your son will also be a little familiar with the new atmosphere in this tour and it will make it a little easier for him.
You can also assure your son that he can keep in touch with his friends by keeping their phone numbers - and calling them whenever he wishes.
Hope this helps. How old is your son?