I cant imagine a 10 yr old not loving it...there are soooo many activites for a boy of that age to do (cricket, footy (aussie rules), soccer, karate, tennis, swimming...etc, etc)

Have you discussed how he can keep in contact with his family + friends (emails, letters, skype etc)
You will probably find too (as most expats do)...once you are out of your home country, you seem to have a lot more visitors !!!!

Once settled in school, Im sure he will make lots of friends, and at his age (same as my son), you will find that after school play dates and activities, will help with the transition)

I dont want to trivialise how he is feeling, because it is an upheaval

Perhaps, plan the holiday with him, get his input on what he wants out of the move (ie he may want to live where its warmer ie : further nth, or he may be interested in regional living)..get his input too