I think you hit the nail on the head in saying that your H wants it all. What in the world does he think that divorce is? That after it is done that everyone will be one big happy family?
Your H is still deeply in the tunnel and somehow he doesn't realize what this all will mean. I wonder if the thought that someday D could have a stepfather has even crossed his mind?
Well, I truly wonder how the ow will react when she's left sitting in the apartment while H is out spending time with his wife and child. I wonder if he'll even tell her that's what he's doing. Well leaving her on Christmas Eve won't be a hard one to figure out. LOL It may make for some unhappy holidays for them.
It's possible she could get very resentful that she's not spending the holiday with her own children so that she could be there with H. He turns around and leaves her alone to go spend it with you and D. Potential powder keg there! LOL
It sounds like you may have some very interesting times coming up...