I don't know if this is a new issue in BNW, but I sure didn't notice this in GK.
So, apparently AI settlers are now completely ignored by barbarians, which means they can just rush a settler without a single military unit with Raging Barbs option on, and then walk right past the barbarians and settle wherever they please.
I noticed this while exploring in a new game; My scout was looking at a Shoshone settler walking by a barbarian camp(!) unescorted, surrounded by 3 barb brutes. I was appalled at the stupidity of the AI, then was even more astonished when the 2 brutes which weren't guarding the camp decided that capturing that defenseless settler right next to them was dishonorable or something, and approached my scout instead(full HP).
I would've wrote this off as a freak AI ******ation if I didn't witness this again and again and again (that's four times total)... but the fourth time, this Indonesian settler was just wandering back and forth next to a barb camp actively spawning units for several turns without getting captured.
I just quit that game because it was simply getting absurd.