If it is true, the #DarknessinTyvia suggests a quite interesting treat for an atmosphere/level design perspective.
Tyvia is representative of the cold northern cultures on Earth - specifically places like Russia, Poland and Sweden. There are walruses and great wine apparently, and the terrain and people are described as hardened survivalists living at the edge of the world. It would be quite a hard place to visit. Anton Sokolov from Dishonored is from Tyvia.
Further, the heart says "he has the manner of a Tyvian Swineherd"
i think its fake just cause it is too soon IMO.. the game released fall 2012 and Bethesda as a publisher is not known for realising games fast, they take there time with games and avoid milking a franchise
what is stopping the "leaker" from making a photoshop logo putting it on a projector/screen and having his/her D̶S̶4̶ ̶s̶i̶t̶ ̶r̶i̶g̶h̶t̶ ̶b̶e̶s̶i̶d̶e̶ ̶i̶t̶ monitor light on