Winter Veil 2010 runs from Wednesday, Dec. 15 through Sunday, Jan. 2 this year. Unlike November's holiday, Pilgrim's Bounty, the Merrymaker meta is required for What A Long, Strange Trip It's Been. If you've already got a Violet Proto-Drake or just don't care about the meta, Winter Veil will also give you the opportunity to turn your mount into a reindeer, become a snowman with a unique dance animation, and get noncombat pets and snowballs. Of course, if Santa RNG thinks you've been bad, you'll just wind up with Coal.
Though not always. Keep at it! Even Santa RNG has a heart.
Past the cut, I've revised and expanded our 2009 guide for anyone looking to complete the meta (and earn the title) Merrymaker. Cataclysm has almost certainly affected how you'll do this holiday, but unfortunately, there's no hard information yet as to how. I doubt that Blizzard had the time to tinker extensively with Winter Veil in the crush of work surrounding a new expansion, but we'll see. As always, I'll be around as the holiday goes live to check and update the article. For the moment, I've included some commonsense speculation on likely changes (such as when an NPC's probably changed locations due to city/topography upheaval).