So, I don't know if someone else figured this before, but 400 days shows stories of 5 characters. Season 2 is going to have 5 episodes again, and I am now thinking that each episode is going to be a story of each character from 400 days and how he met others.
Whole season will end with Tavia taking them to her community, and season 3 will be about that.
So basically 400 days tells us it's gonna be a story about how each character got through those 400 days and met Tavia. It's quite obvious to me now. I don't like it. :(