Uh, didn't Law LEAVE this chapter with Luffy?
I don't think any meeting will happen. In fact, I think it's a 50/50% chance whether we'll even see what happens at the island. If the story follows Luffy/Law and they high tail it, we might just get a summary of how it ended and not actually see it. Sorta like the Shanks vs. Whitebeard part.