Does Dragon Age Inquisition make use of save data from previous games in the series? If so, what benefits does this provide?
You can set up your game world for Dragon Age Inquisition using the Dragon Age Keep website. There you can select your actions in the past two games and import those as a game world state into DA:I.
I'm not far enough into the game to actually say anything about the consequences of setting up those past decisions, but I would imagine that they are integrated into the story in Dragon Age Inquisition.
As far as I know there is no way to import savegames directly, you have to use the Keep to set up your game world.