A new button?

[LuckyBlackCatXIII]

That button has been around since the Justine update. Basically it's a collection of short stories that explore the other characters that make up Amnesia's world, such as the Zimmerman's daughter, Gabriel the Outrider, Herbert and his friend that gave him the map to "Tin Hinan's tomb" etc etc.

If you were interested in the plot of the game I recommend you read it, they're all very interesting.