That's 20 times the ammount of lines in Fallout.
More information.It seems that it tackles the hard issues which are usually eschewed by videogames, like slavery, homosexuality, drug addiction, child related violence. The player will not see any mature rated image in the game, but the oldest profession in the world is a theme in some of the quests. The developers are keen to point out that the maturity level of the game is in line with that of the first two Fallout releases.