I think it will be an arc similar to Wano/Alabasta/FI/etc. so with fights,population to save etc. i dont expect a different arc. Everybody at this point knows that Oda loves vikings etc. so i expect him to spend a lot of chapters in Elbaf. But Elbaf,hopefully,will be more connected to the One Piece than Wano was (in this sense Oda trolled us,it made us believe both in interviews and with dialogues in the story that Wano was more involved with the One Piece than how much actually was. Kaido talking about "a specific reason why he was there" which at this point i think it was just because of Pluton,and Big Mom saying that "a piece of the One Piece" was in Wano. Also,in some interviews him or an editor said that the ending of Wano would have given us big revelations connected to the One Piece,but it didnt happen,unless it was just a reference to Pluton,but we didnt even saw the ship,so big deal!) so i hope that in Elbaf we actually get some pivotal revelations about the One Piece and the Void Century. About the fights,i think Luffy,Zoro,Sanji and Usopp will surely get one. I think there will be powerful giants but also other people from the outside world could come,like the Marines or the Revs,or the RH pirates. And who knows if the RA or the RH pirates will be allied or not!