For the first time in almost two years, there will be an all-new live-action One Piece show at the One Piece Tokyo Tower. Its title is ONE PIECE LIVE ATTRACTION: MARIONETTE, and it will be introducing Sabo for the first time. They also revealed him, along with Luffy, in the visual:

In the attraction, Luffy will be taking on Caesar Clown. It will pick up from where the previous attraction, “PHANTOM,” left off and will have a run time of approximately 20 minutes. “Marionette” will also feature new projection mapping and special effects.

Aside from the Straw Hats and Sabo, the attraction will also feature
Caesar Clown and Charlotte Cracker, as well as Tokyo One Piece Tower original character, Diva Ann. Eiichiro Oda himself designed the latter. “Marionette” will begin its run on 24 April 2019.

Source: Anime! Anime!