We got the welcome news recently that FUNimation is bringing out the 2015 special One Piece: Episode of Sabo as a combo DVD/BD release on March 19th, 2019.
The special is going to capitalize on the return of Sabo to the series recently in the Dressrosa arc.
One Piece has done a few specials before, with Merry getting on and Nami as well as a few others.
One Piece - Episode of Sabo | Official Trailer (Own it 3/19)