The "Jingle Cruise" will launch in early November at both parks, and will feature special decorations, new seasonal jokes (though hopefully just as corny as the usual schtick), and holiday music.
According to the Disney Parks blog:
In this new seasonal storyline of the attraction, the Skippers have grown homesick for the holidays, so they’ve added holiday cheer to the Jungle Cruise queue and boathouse with decorations that have been mailed to them from home (plus a few they’ve created themselves). The Skippers have also added a slew of new jokes to their tours that are the perfect way to get guests in the holiday spirit. Additionally, Jungle Cruise boats have been renamed with the holidays in mind, and if guests listen carefully, they may hear a holiday-themed radio broadcast playing in the background.
The Disney Parks typically go all-out for the holidays. At Disneyland, the Haunted Mansion has already undergone its annual transformation into a "Nightmare Before Christmas" theme - and once Halloween is over, all Disney Parks will be decked out in glorious holiday decorations.
Holidays at the Disney Parks also include special seasonal entertainment, festive decor throughout, seasonal treats at select restaurants and food carts, holiday-themed character outfits, holiday parades, and special "snow" in certain areas of the parks.