Just before the series premier I saw a video somewhere on the Internet about how there was an orchestra performance in the series premiere while the opening sequence came on the big screen — well, many people pointed that it was fake since the sigil on King's Landing was of Baratheon (+ The Great Grass Sea was also shown, which we know for sure that there's no business now.)
The opening sequence came up and interestingly there's the Baratheon sigil still on King's Landing!
Here's a screenshot
We saw last season that Cersei (of House Lannister) was crowned the queen and on a discussion thread I also read how the rule of succession titled Cersei the Queen automatically (as a member of House Lannister).
Am I missing something here? Cersei is all about taking the Lannister name further so it is foolish to think that she would continue to be queen for House Baratheon.
But the opening sequence that was shown during the orchestra performance was probably fake and not from this season premiere because it still had The Great Grass Sea shown which was not shown in the episode.