RPS has posted an interview with the developers. It's quite interesting. The comment about team size and time scales may be of particular interest to some people:

Quote Originally Posted by RPS interview
Sylvain Sechi: We moved from prototype to production with ten people, roughly ten people, for 6/8 months, set up the engine first, the design, making sure what we wanted in the game, make some prototypes and then we moved into full scale production for almost two years…
Thomas Veauclin: One year and a half.
Sylvain Sechi: One year and a half maybe for full scale production with 45 persons, which is actually not so much compared to Bethesda or Bioware which have at least 100, 200 people.