Board Thread:Anime/@comment-108.200.170.159-20160206074920/@comment-26495049-20180711164312

The arc after Marley arc (the one we're entering now) will likely be the final arc in the manga.

Assuming it's about the same length as the Marley arc, we're looking at about 24 episodes for both arcs combined.

This would translate to 2 cours, which would give either

A) Season 4 as the final season with 24 episodes

or B) Season 4 with 12 episodes to cover the Marley arc, followed by Season 5 as the final season.