Major Nelson interviews the lead level designer here.
http://majornelson.com/archive/2011/03/06/show-389-dragon-age-2-yoostar-2-homefront.aspx?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+MajorNelsonblogcast+%28Major+Nelson.com+Blogcast+%28MP3%29%29&utm_content=FeedBurner
http://majornelson.com/archive/2011/03/06/show-389-dragon-age-2-yoostar-2-homefront.aspx?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+MajorNelsonblogcast+%28Major+Nelson.com+Blogcast+%28MP3%29%29&utm_content=FeedBurner