Source: MMOC

Crestfall and Snowblossom Island Expedition Maps
Two new island expeditions have been added to the map rotation for Islands.

• Add pets to ItemDB
• Add pets to Core (IE tracking)
• Add new map IDs to Core (IE tracking)
• Testing: Crestfall - Island from Warcraft II
• Testing: Snowblossom - A Pandaren village

As WDBX is broken I have no easy way of getting the map ID... Maybe I can find another tool, but otherwise I'll have to wait until the maps are on rotation.

Edit: https://wow.tools/dbc/?dbc=map :D

Added in b437b3d.

Needs testing, but I don't see how the map IDs could be wrong.