Question: is wano the last arc?
Answer: One Piece to end in 2-3 years, Wano is the final arc, says Oda. From an editor's note on the latest Jump issue, so yes, this is pretty official. "The Wano Country Arc will ramp up to the climax of the series as the final arc!!" "One Piece will be concluding in 2-3 years from now!!"