Personally, I think the next DLC will be about temperate woodlands (the presence of typical animals like racoons, skunk and red fox is very suggestive; apart of the fact that wombats can live in temperate biomes). For that reason, this is my list:
1. Racoon (Procyon lotor) (North America; Grassland, Tropical, Temperate and Taiga biomes)
2. Striped Skunk (Mephitis mephitis) (North America; Desert?, Grassland, Temperate and Taiga biomes)
3. Commom Wombat (Vombatus ursinus) (Oceania; Tropical?, Temperate biomes)
4. Red Fox (Vulpes vulpes) (North America, Europe, Asia, Africa and Oceania?; all biomes?)*
5. Wild Boar (Sus scrofa) (Europe, Asia, Africa; Desert?, Grassland, Temperate and Taiga? biomes)*
6. White-Tailed Deer (Odocoileus virginianus) (North America and South America; Desert, Grassland, Tropical, Temperate and Taiga biomes)
7.A bird from the Phasianidae family (Golden Pheasant, Wild Turkey, Western Capercaillie)
8. I don't have any idea... perhaps a lizard?
About habitat animals: Wild boars are common animals in european forests and can fit with the thematic. White-tailed deers could be part of the DLC because they can be piebald, and are present both North and South American forests. A bird could be great, specially from the Phasianidae family, because we need more land birds if the aviary mechanics are not available in the medium term. Finally, if there was a chance, i would like to see the spectacled bear.
* Because of their wide distribution, the developers could add specific subspecies