I don't know what's set in stone for v3 but this would work for either v3 or v4

1. it should be a lot larger--the map! a lot more exploration, instead of a tiny map

2. maybe if you can make multiple villages, like colony an island? you can pick which 1s to stay at each location and make mini villages or tribes... make rafts lol

3. really just more of everything! I feel the first two games are over so quickly then at some point in the game the villagers just do everything on their own and its over and there's no reason to keep checking up on them because theres nothing left to discover or do.. maybe have natural disasters like hurricane come and wreck them XD