If the trailer is any indication, Season 6 of Game of Thrones promises to be a blast. And, because the show has now out-paced the books, it will be the first time readers of the books will actually be surprised as the show unfolds. (Note, HBO warns that the trailer has "mature content," so it might be NSFW.)
|I believe there's a reason she's at Castle Black!|
The trailer hints to a ton of events, including the Ironborn Kingsmoot, what looks like a flashback to Robert's Rebellion (with Ned Stark!), Bran roaming beyond the wall as the new three-eyed raven . . . and what I suspect will be the resurrection of Jon Snow!
James Whitbrook at io9 posted an article called "All the Secrets Hidden in Game of Thrones' Brand New Trailer." He does a fabulous job of piecing things together, and I think his observations are spot on. You can read his post here.