Riot always teases new content in the battle pass and now with the night market I believe I've figured out what riot is teasing.

So in the battle pass there is a player card that has the back of a container ship on it, and the coordinates in the night market are for somewhere in the Carribean.

Lastly a map name is crossed out in the night market the name is breeze and I think it gets pretty breezy on a container ship.