I dug around and found this recipe:
http://www.brewersfriend.com/homebrew/recipe/view/24196/hells-bells-christmas-ale
Their description is:
The basic inspiration for Bell's Christmas Ale was to create a sessionable holiday beer, using locally grown malt, which would stand apart from the array of spiced winter warmers that are typically introduced this time of year. In contrast to many other seasonals, Christmas Ale doesn't contain any spices: all of the dry, toasted notes & subtle toffee flavors come from the 100% Michigan-grown barley, custom malted by Briess Malting, while a blend of hops from Michigan & the Pacific Northwest lend earthy, herbal aromas. At 5.5% ABV, it stands as a smooth, highly drinkable beer intended to complement holiday menus, not overshadow them.
Based on their description, the recipe someone posted to Brewer's Friend is way different just looking at the ABV. There's a ton of sugar in the recipe which sounds good, but I think the recipe can be great but it is not even close to Bell's. Point of posting is that the guy is calling it their Christmas ale all the same.
All this aside, taking a stab in the dark, I think I'd try doing this:
4 lbs amber LME
3 lbs pale LME
1 oz Chinook hops because their profile indicates earthy/piney @ 15 min?
.5 Willamette hops @ 60 mins?
1/2 lb roasted barley
1/2 caramel 60L
1/2 lb white wheat malt
1 oz brown sugar @ 10 mins
2 cinnamon sticks @ 5 min boil
1 oz sweet orange peek @ 5 min boil
BeerSmith says it will be about 5% ABV 1.052 OG and I think 1.013 SG. Looks like it is about 31.8 IBUs and this can obviously be changed. But I was trying to target the "sessionable" nature of Bell's. The problem is clearly that Bells isn't spices and I think we have to because they use proprietary hops, malt and barley.
I'm only just getting into making recipes and I'm very new, but I'd brew this and buy Bell's Christmas ale when it is out. I mean, for science. I haven't had the brew in a year so it's hard to remember.