After all these years he lost blackblade and said he will make enma into black, so he gonna make blackblade in this arc
Myguess kaido will appear above wano capital (with his awekeing fish form or dragon) same as that dragon appear in wano at ryumas era. So zoro/ryuma had to slash dragon neck at above wano capital and they will save the wano. People will recognize him as new sword GOD as he said he want to lead wano samurais. Wororororo!