Is there any way that your son could 'meet' some of kids (or even teachers) from the new school who are interested in some of the same things he is through chat or e-mail before you move?
Having some personal connection already in place before he gets there would probably go a long way to making it easier on him.
Has your son seen the new neighborhood? If not, can your DH make a video of the area, including places and people that he thinks your son will like? Neighbors, restaurants, parks, museums, skating rinks, malls, arcades...anything that will get him looking forward to spending some time there. Even visiting the new area on Google Earth might be helpful. Generally, the more familiar people are with things, the more positive thoughts and feelings they have about them, so getting your son familiar with the new area may help him feel better about going.
