Specifically, this is the coat of arms of Francis Patrick Keough who was the Bishop of Providence from 1934 to 1947 and the Archbishop of Baltimore from 1947-1961. I can't really see A&D leaning heavy into a religious theme, especially with the controversy surrounding the Fallen. If it's just hinting at a high-ranking religious official, I can see a connection to the High Sparrow from GOT.
Just looking at the history of the event GOT could fill the void of the anchor TV show that they have relied on since TWD. But with the leak controversy and issues that arose last spec season, I doubt we would be getting any clues or hints about a GOT house this early if it actually is coming this year.