He most likely will either text, email or post to them via FB for a while. Who knows, he may even arrange to see them over a long extended holiday weekend...but that's not something you have any control over right now.
Now, don't expect him to contact you or the children all of the time after he moves. He's going to be in euphoria about moving and checking out the new location. Eventually that will get old and then the contact will begin.
He's made up his mind and he's going. for now, wish him well and then continue on w/your life. He needs to make this journey in order to grow up.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
