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I'd just try to stick with his normal routine as much as possible and be calm and upbeat about the move when you talk to him about it. We just moved a little over 3 mos ago, and my 3 yr old still says, from time to time, "we are in our new house" "this is our new house", and asks if we are in our new house, etc... and right before the move he would talk about moving (he has older siblings who would talk about it a lot). And yes cut him some slack. Its going to be a bump in the road but it will be OK. I always (military family) seem to get stuck moving during the completion phase of potty training and we always seem to get set back a little, but it works out.
My wife and I moved several times when my son was younger including a stint that found us in TX for a year. Kids crave routine and normalcy. Anything that disrupts that gets them off kilter and it comes out in ways like tantrums or accidents.
Other folks already gave you some great advice and I would recommend the same. Just remember that it does get better and trying to stick to as normal a schedule as possible really helps. One thing we did to assist during the moves was to give my son his own special box for his favorite toys. It was the last thing packed and the first thing off, so he would immediately have his most special things with him in the new place.
It does affect them more than they let on. After our last move (hopefully the last, lol) my son was looking through the house and said, this is it right? This is our house and we aren't moving again?