We've moved twice with cats who are resistant to change. Each time we kept one room empty (the one that would eventually keep their litter box) and confine them to that room for about a day. Of course, while they are confined we are in there playing with them, soothing them, talking with them etc. Overnight we let them sleep confined in the room so they don't get lost and freak out - everything comfortable and familiar is in there; their beds, food/water, a blanket that smells like mom and dad. The next day we let them roam a little bit more and just gave them lots and lots of attention. It'll sound strange but we kind of 'took a tour' of the house and 'invited them' to the various rooms. Any mewing we immediately acknowledged and called out for them, relieving the anxiety. After roaming the house all day, they spent night #2 in 'their room', then were allowed free range of the house.
If you are moving to a bigger house with more levels than you previously had you might want to try an extra litter box (like one in the basement and one on the upstairs level). That way if they get lost or confused they won't start 'peeing a corner' in your house and continue that behavior.
Good luck!
I should probably add that my cats really hate, hate, hate change and did not adjust well to the first time I moved (they literally would get lost and 'cry' in a panic). Yes, I have wimpy cats lol.