Here we have an interview detailing Cullen's role and character in Dragon Age: Inquisition. After his reveal yesterday as one of our prime advisors, there is no doubt that in the coming days, more information will be revealed about the advisors of the Inquisition, with the "Scribe Girl" being a prime favourite to be revealed next.
The link to the interview can be found here.
Brienne Battye asserts that: "Cullen spent more than half of his life in service to the templars. He's gone through a lot over that time. He survived what happened to the Circle Tower in Dragon Age: Origins, then watched Kirkwall fall to chaos in Dragon Age II. In Inquisition, the sky's torn open, demons are running loose, there's war… things aren't exactly looking up."