I received mine on the 24th and my friend gets his on the 11th and we both got ours on schedule. You are supposed to get it on your monthly anniversary of your lifetime sub. If you are a monthly sub then you get it on your billing date if I'm not mistaken.
Maybe with everyone out on vacation the last week of the year there is some manual process they need to complete for those who fall into that date range. I would still put in a ticket like someone else said just in case.