I was beginning to wonder what was going on with you! I would just proceed with doing Christmas as normal and see what happens - What is he going to do; Live at the office over the holidays?!? I am totally of the mind that you should keep doing what you did normally, and if he wants to step up and get involved, the door is open for him.
Don't ask him what he wants to do - Tell him what you're doing, and he at least knows what to expect. Just make sure you actually stick to doing what you say, otherwise it'll throw him off.
Hope you're having fun with the D's with H out of town!! I just got D's school pictures today - funny stuff