It's been stated all DLC will be free, and any paid content will be purely cosmetic. One of the fundamental concepts of the game is frequent small updates with occasional bigger DLC. They have two teams working on these respectively.
When you die you lose nothing and respawn not far from where you died.
There are no human NPCs for the reason of not knowing when at a distance if a human is a real player or not. Instead there is a variety of intelligent ghouls (The Scorched) who replace the role of raiders.
You can join friends who are in different servers. Building you create is persistent between servers, but if the space you have is taken you get to choose where to redeploy.
24 people servers.
I'm surprised this video has not got more views as it contains a lot of new information and some views we have not before seen: