I mentioned in an earlier post that I contributed a Marvel holiday story this year (in addition to my DC holiday story that's on sale now), and now I can give a few more details.
It's an 8-page X-MEN holiday story that will run exclusively on Marvel Digital Comics Unlimited. The story goes live on December 23rd. I hope to soon be able to post a page of preview art, but I don't have any to show at the moment.
I imagine the story will see print at some point, whether it's as a bonus story in a Trade Paperback, or as part of an anthology, but there are no plans currently to print it.