Will there be a PDF that we can hand out to the players so they can get background and theme in advance?
The quickerstart pdf (yet to be released) would probably be something like that.
You could probably make one... though why would you deprive yourself of introducing players to the universe yourself, with your own words and thoughts, plots and angles?

Indeed. The personal recipes of a great chef (rulebook descriptions) are not the same as the meal itself (personal garnish).
What I think Vanamoinen means is, "start your first batch of characters as backwater yokels that don't know much about anything".
If, on the other hand, you have a player in love with Middle Eastern themes, perhaps have touristed in Casablanca, Cairo, or Istanbul (or, frankly, certain vibrant districts of most big western cities), you could probably trust his or her powers of improvisation while still remaining in bounds of what the culture would allow.
For a lot of Westerns, there are few cultural experiences that rival being awakened for the first time by
Fajr (pre-dawn call to prayer).
I'd love to put something similar to that kind of discomfort/uncertainty/exotic Other-ness in the game for characters visiting somewhere for the first time.
"Se til helvete å komme dere vekk. Det er ikke en bikkje! Det er en slags TING!
Det imiterer en bikkje. Det er ikke virkelig! Kom dere vekk, IDIOTER!"