Oda has said he can't say to much otherwise people will know what the one piece is.
This chapter more than showing us Luffy's dream, it showed us that he had another dream, something a lot of people failed to see since always, many though that Luffy just had 1 dream, so Oda in this chapter just clarified this so there isn't no doubts.
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For that reason, I thank him since many people thought it was just to PK.