I'm online @WiseOldOwl just in case you want a Mod's help.
I feel that a lot of the responses have been overly harsh and people have projected a lot of their own MIL issues onto you. Sheesh, you haven't even had a discussion about it with him yet!
I think being hurt and a little miffed is perfectly understandable. You seem like a reasonable person, I'm sure you'll handle the situation well and perhaps come up with a compromise that enables you to spend some quality time with him to compensate for his absence (I think Xmas Eve dinner would be lovely).