According to an article by the official One Piece website, Fuji TV will air a new One Piece TV special on Dec. 19, to be aired that Saturday evening from 9:00 PM to 11:10 PM (Japan Time).

This original, brand-new One Piece TV special will take place on an “ability suppressing island,” a foggy island in the new world that makes devil fruit users unable to use to their abilities. The main villains of the special will be the Foxy Pirates on a quest for a revenge match after their last encounter with the Straw Hat pirates during the Long Ring Long Land story arc. This time around, three additional members, Kômei, Dôjaku and Kanshô have joined the Foxy Pirates, and against his crew’s wishes, Luffy again accepts the challenge.

Do not read further if you wish to avoid minor plot spoilers…

Zoro and Sanji, while gorging themselves during an Eating Contest, are suddenly plagued by a sudden laziness due to the malicious effect of the so-called “good-for-nothing-shroom” and are subsequently thrown into a cage. All according to the plan of the genius tactician Kômei (whose name could be a reference to the light coming from bodhisattva, which symbolizes wisdom and compassion) to suppress two of the Straw Hats’ biggest fighting powers. Following their captured crewmates, Luffy and the others finally arrive at the infamous island “Nebulandia,” an island covered in a mist of sea water, rendering all devil fruit users useless. Unfortunately for the Straw Hats, following Sanji and Zoro to this island was also part of the “Genius Tactician” Kômei’s ingenious plan and they are suddenly attacked. Will the Straw Hats be able to escape this island safely?

Toei Animation’s Hiroyuki Sakurada had this to say:

This year’s winter One Piece special is a completely original story. It’s an action-packed adventure with Luffy playing a big role! While on their way in the New World, suddenly a character with a deep connection to Luffy appears in front of the Straw Hats, he’s the strong antagonist who also appeared in the original One Piece manga: Foxy! Foxy has come all the way to the New World so he’s become considerably stronger, but this time, the real enemy is the genius tactician “Kômei” who’s come prepared with a cunning plan to completely annihilate the Straw Hats. Look forward to a big battle and big adventure on this surprising island where devil fruits become a weakness! Also of note, the One Piece TV anime’s first director, Mr. Kônosuke Uda, who obviously knows everything there is to know about what makes One Piece great, will be joining in on this special! I believe he’ll make sure that the characters will shine through in this special. Atsuhiro Tomioka will pen the script. In addition to his previous work on One Piece, he has also worked on the Inazuma Eleven movie series, and the Pokemon movie series. I’m convinced that he’ll bring us a special filled with a sense of adventure that will make our hearts beat faster than ever before! There’s also going to be special guest voice actors to look forward to! I hope you enjoy!

Toei Animation’s Yûta Kano had this to say: