We have moved multiple times with DD8 (HG) and DD3 (LOG?). DD8 was born in Japan, lived in another country and then moved to the US with us when she was 3 1/2. Since coming back (for DH and I) to the US, we have moved across the country and within one state a few hours away from our previous house.
We had some pretty interesting discussions with DD before and after each move. She was also very concerned about "not being able to go back
home
(ie. the previous place we'd lived)." She understood that she and her friends would change and that they would get new friends and no longer have experienced the same things. She still keeps sporadic contact with friends from other places, she has an intense desire to go back to all of them and at least see everyone she knew so that she can see just how much they have all changed. She has also become very philosophical about making friends and fitting in with classmates/neighbors.
I actually think that the experiences she has had have been great for her. It had allowed her to see life from a different point of view than most ehr age and as a result alot of her "big idea" questions have been answered by her experiences, rather than by having to believe what we say are the answers.
We tend to see the positives of the experiences more than the negatives, that most people focus on. In fact, after DH finishes school we will go back out so that DDs can have more of the experience.
A good topic to look into, if you are going to be overseas for more than a year or so is anything about
third culture kids. Third culture kids are kids who have spent a significant amount of time living in a culture that is not the one their parents come from. There is a lot of negative that can occur in terms of not fitting in as adults, but there are also a lot of positives in terms of the type of lifestyle they have and the experiences they have.
It will also have a profound effect on you if/when you return to your country. I actually think that DD had an easier time adjusting to life in the US than DH and I did after being overseas for 11 yrs.
If you want some more specifics, you can either pm me or ask here. I'm happy to share our experiences. (The good, the bad and the ugly)