The bottles, officially known as Orb Bottles, feature a spherical plastic bottle with a wrapped Santa Claus design on one half (I was going to type "side" but spheres only have one side) and the Coca Cola logo on the other. They cost $1 per 13.5-ounce bottle.
I assume they'll be shipping until Christmas, after which you'll be chasing after a dwindling supply.
One of my cousins specifically made a trip to Walmart (a couple cities over) solely for the purpose of securing herself a few bottles:
I have to admit, they're pretty cool looking. I've heard some people call them "Coke Bombs."