I'm curious about both starting spawn location and spawn location after you have a tribe, totem, village etc.

We'll just have to wait and see, but it may be hard finding other tribe members at first. Even if we all spawn in the same starting area, new tribes will want to move away from there to set up camp. That means players joining the game even hours after the tribe has moved off may have a hard time. Of course good communication will help, I'm guessing that if there is a map it won't be all revealed. I wonder if you can share your map with other people, assuming the map is a developing thing and you don't actually find a phisical map.