The official description from the Limited Time Magic Site is as follows:
Prepare the port for a boatload of holiday cheer headed your way, courtesy of the Jungle Cruise… or should we say "Jingle Cruise"? Starting November 12, 2013, this classic Adventureland attraction will be decked out from boathouse to dock with a hodgepodge of holiday decor. And as part of Limited Time Magic, you can celebrate the seasonal enhancement with a complimentary "Jingle Cruise" mini poster, available while supplies last by the exit of the Jungle Cruise at Magic Kingdom park. This is your chance to hear the skippers slip a holiday joke into their already hilarious spiels – and a perfect opportunity to take home a ferociously fun piece of the festivities too!