This is the first idea of the list (this formation is my favorite!). The Morrison Formation is a large geological formation dating to the Tithonian age of the Late Jurassic Period, about 156-146 million years ago. It spans from the Southwestern USA all the way to Southwestern Canada. I imagine it would have a large amount of species in comparison to other maps (specifically, 9 species). I imagine these species would be the following:

Allosaurus Fragilis (Jimmadensi could work too)
Ceratosaurus Nasicornis (Dentisulcatus and Magnicornis could work too)
Torvosaurus Tanneri
Ornitholestes Hermanni
Diplodocus Carnegii (Longus and Hallorum could work too)
Brachiosaurus Altithorax
Apatosaurus Ajax (Louisae could work too)
Camarasaurus Supremus (Lentus, Grandis, and Lewisi could work too)
Dryosaurus Altus (Elderae could work too

I also imagine that this map would have about 10-20 skeletons you could dig up due to the Morrison Formation's rich amount of fossils. The map would be quite large too, being in the badlands of the Western USA (specifically Colorado or Wyoming. I guess Utah could work too)

rooms that would be introduced with this map's update: 2

This is the second idea of the list. The Oldman Formation is a medium-sized geological formation in Alberta, Canada. It dates back to the Campanian age of the Late Cretaceous period, about 77-76 million years ago. it's quite small and overlies both the Dinosaur Park Formation (a formation that's already in the game) and the Foremost Formation. Because of this, all 3 formations have very similar fauna and flora. This map would basically add more dinosaur species from the Dinosaur Park Formation that the Grizzly Mountains map doesn't have. This map would have a normal amount of species (specifically 9 species). I imagine these species would be the following:

Daspletosaurus Torosus
Chasmosaurus Russelli
Corythosaurus Casuarius
Struthiomimus Altus
Albertaceratops Nesmoi

This map would have about as many skeletons as the Dinosaur Canyon map. It would be located in Alberta, Canada (near the Quarry map)

rooms that would be introduced with this map's update: 1

This is the third idea for the list. The "Mammoth Steppe" was a large grassland/plains biome that spanned from Spain all the way to Canada during the last glacial maximum (or Ice Age) of the Holocene epoch. This map would be quite a big deal for the game because it would introduce the first discover-able mammal mega-fauna. The update that introduces this map would likely introduce a feature where you could travel to different parts of the world instead of being only in the USA (and some of Canada). If feature is ever added, then the map would most likely be located in Siberia. This map would be bigger than the Quarry map, but would be smaller than the Dinosaur Canyon map. It would have not much species (5 species specifically). I imagine those species would be the following:

Mammuthus Primigenius (Woolly Mammoth)
Coelodonta Antiquitatis (Woolly Rhinoceros)
Megaloceros Giganteus (Irish Elk)
Bison Priscus (Steppe Bison)
Panthera Spelaea (Cave Lion)

This map would have a bit less skeletons than the Grizzly Mountains map, but would have more skeletons than the Dinosaur Canyon map

rooms that would be introduced with this map's update: 1

This is the fourth idea for the list. The Niobrara Formation is a medium-sized geological formation located in Kansas and Nebraska in the USA. It dates back to the Coniacian, Santonian, and Campanian ages of the Late Cretaceous period, about 87-82 million years ago. This map's update would allow marine animals and flying animals to be hanging from the Museum's ceiling, but could still be put on a ground exposition. The map would have about 7 species. I imagine these species would be the following:

Pteranodon Longiceps
Geosternbergia Sternbergi
Nyctosaurus Gracilis
Tylosaurus Proriger (Nepaeolicus could work too)
Xiphactinus Audax
Styxosaurus Snowii
Platecarpus Tympaniticus

This map would have about as many skeletons as the Dinosaur Canyon map and would be about the same size. I imagine the map would be located in Kansas.

rooms that would be introduced with this map's update: 1

so those were my speculations for future maps. you can send requests for more map ideas in the comments below as i want to add more speculations for future maps. basically, just comment the name of a geological formation or just a prehistoric enviroment and i'll do the research. Then i'll add the speculations i came up with. I'll also "credit" you by putting "Requested by: (Your Steam Username)." Anyways, i hoped you enjoyed reading my speculations for future maps for this brilliant game and i hope you have a great day!