Yh Alpine and Islands were two pretty popular ones and I do still want them if we have another full year of DLC (big emphasis on if)There is a whole topic to be made about potential good pack ideas that never were. Off the top of my head:
Madagascar / Islands (scenery pack)
India (Animal Pack)
China / East Asia (Animal Pack)
Mediterranean (Scenery Pack)
Mexico / Caribbean (Scenery Pack)
A proper desert pack (Animal Pack)
Rainforests (Animal Pack)
LATAM (Animal/Scenery Pack)