Obviously this thread has been dead for a while but I just tried St. Arnold's Christmas for the first time in January of this year and fell in love with it. Tried the extract recipe listed here, let it condition for 2 months prior to bottling and have it in storage now. I did try one after about 3 weeks and can already tell it is going to be phenomenal but would love to hear from anyone who has brewed it to find out what the ideal bottle conditioning time is to really let the flavors blend.
Oh and thanks DeRoux's Broux for posting the recipe from the brew master. I am still amazed that this recipe was out there.