Clash of Kings is where the series really starts to get complicated. New characters are introduced and old characters are split up and sent away to far away locations.
This trailer is notable to me mostly because of the glimpse of Melisandre and the small bit we see of Arya. There’s a lot of King’s Landing in this teaser and King’s Landing has never been my favorite. The first teaser is much more exciting to me because of how Stannis/the Wall is the main focus. Still looks great though.