http://www.gamepressure.com/e.asp?ID=73
Can you explore Vizima freely?
No, the story will be limited to the palace in Vizima.
NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO .__.
Are mission targets marked on the map too?
They are, although, similarly to Dragon Age: Inquisition, these are either precise spots/characters or broader areas that you first have to explore (e.g. using the medallion). Of course, the only missions marked on the map are the ones you set as active in the journal, thus the indicators can be easily removed.
This is a shame.
Is it possible to adjust draw distance on PC version?
No. Most distances (e.g. for meshes) are set in assets
And this is sad.