Dungeon Magazine #102 came out with the next adventure in the Shackled City adventure path called Zenith Trajectory. In it the adventurers went from the town of Cauldron to an Underdark temple to rescue a Dwarven defender among a cult of kuo-toans.
The player versions of these maps will allow a GM to place them just about anywhere. The high resolution, Player, DM, gridded and non-gridded versions are on this Supporter post: https://www.patreon.com/posts/zenith-high-maps-117220805