So I opened the City of Secrets Chapter Pack, and was intrigued to notice that, while the cover art of the chapter pack depicts a man sitting on the Iron Throne, there were no cards in the pack that referenced the Iron Throne, or used that art. Interestingly, however, the chapter pack contained a card, Bound by Honor, that used the cover art from the Core set of Robert and Eddard. The Core set itself, however, did not use this art.
Also contained in City of Secrets was Ser Barristan Selmy, with artwork that matches the cover art for a later chapter pack in this series. That chapter pack, presumably, will not contain Ser Barristan Selmy.
The artwork is great, the cards are great... but what's the deal? Why not just put SBS on the cover of this pack?