In Chapter 1000 Ace and Yamato both reference the secret dream Luffy and Roger share.
This was set up as far back as Sabaody when Rayleigh told Luffy about Shanks:
Since chapter 968 there’s been renewed discussion about the particular words both Luffy and Roger may have said that stood as similar to others, specifically to Shanks, as he recounted to Whitebeard.
From this point of view it’s interesting to note the similarity between the following two scenes. I’m sure people have already realized the connection, but it may be worth pointing it out, if only to start a discussion. The first is Luffy talking to Ace and Sabo, from chapter 585:
At that time I remember people arguing what Luffy might have said, guessing that he probably said he wanted to be the Pirate King, but also noting that it’s a little bit odd to delete the words, if that’s all it was. After all, why would Oda deliberately dampen the effect of an otherwise climactic point in the conversation?