After what transpired in ch 1054, I think we've already entered the final Saga of One Piece. The battle for supremacy, as Shanks is finally making his move to claim the One Piece.
Now, I don't think Shanks is evil, but at the same time I don't see him handing over the One Piece treasure to Luffy on a silver platter. Like he's not gona let Luffy just have it without a proper fight. So if they're gonna meet, it'd be in Laughtale where they test eachother out. As for why Shanks is in Wano, it has something to do with One Piece itself. Oda has said that Wano has huge connection to the final arc of the story, this might be an implication that Wano holds the key to finding the One Piece. Kaido said he chose Wano for a reason and even Big Mom speculates that part of OP is in Wano.
Blackbeard vs Shanks
BB vs Shanks might be happening sooner than we think. We know that BB is also making his move in the background and he's after certain something, as he said he wants to claim it before the Navy does. What if that something is in Wano and BB was waiting for an opportunity to strike. It could be Pluton or the final Road Poneglyph. Since Shanks is near Wano's water they might run into eachother.