Once upon a time, we saw Christmas theming applied to games and promotional demos, such as the
Christmas Lemmings games and demos, the
Fire & Ice Christmas Special Edition demo, and even full games like
Santa's Xmas Caper, and
Daze Before Christmas. There was even
a cheat in Donkey Kong Country 3 to make all of the bonus levels Christmas-themed. These were all titles that were fantastical (and often cute) as it was, so this theming fit perfectly, and was appropriate.
So, what do we have this year? I saw this today, on
the Editors' Picks bar on the UK Amazon Appstore for Android page...

Yes. That is the icon from a Call of Duty game, with the addition of a candy cane and snow. Festive, ain't it?