Well, the Scorpions are red (and I don't mean to say that the classic metal band is communist), so that's kinda Christmas-y. Anyway, even if it doesn't really tie in with the holiday season (not like every story this month needs to), if you're looking for Red Scorpions items for your 40k armies, now's the time to head over to Forge World, as they've got some new characters, a new dreadnaught, and some item kits to help you build the army you want.
From the announcement:
Today, the Red Scorpions make their debut in the new edition of Warhammer 40,000 with a set of heroes, new and old, to fight against the rising tide of Chaos. Whether you're commanding your Chapter with the Regents of the Ordon Rift or harnessing the might of Carab Culln the Risen, there's never been a better time to start playing this mysterious Chapter.Source