A breakdown of everything in the 'Game of Thrones' season 6 trailer

HBO released the first teaser trailer for the next season of "Game of Thrones" Thursday afternoon. Though most of the footage in the 40-second video is from prior seasons, the composition is telling. 

Not only does the trailer have brand-new dialogue, but some split-second images may contain clues about season six. If you haven't seen it yet, watch it now.

Let's break this thing down. 

Warning: There are major spoilers ahead for every season of "Game of Thrones."