The official One Piece YouTube channel began streaming two promotional videos for the anime's upcoming fall special on Monday. Both the 15-second version and the 30-second version preview [Highlight white text to read spoilers] Luffy's battle with Sanji, the climax of the Whole Cake Island Arc.
The one-hour special will air on Sunday, October 1 starting at 9:00 a.m. One Piece usually airs back-to-back with Dragon Ball Super, which will get its own one-hour special on October 8 at the same time. The one-hour special for Dragon Ball Super will air one week later on October 8 at the same time. Each one-hour special will feature two episodes of the television series.
One Piece also received a two-hour "Episode of East Blue" (One Piece Episode of East Blue: Luffy to 4-nin no Nakama no Daibōken) special that aired on August 26 from 9:00 p.m to 11:10 p.m. Crunchyroll and Funimation streamed the special. The story is a completely new work, featuring reanimated scenes from the beginning of the series through when the crew enters the Grand Line.
Source: Anime! Anime!