http://www.comicbookmovie.com/fansites/nailbiter111/news/?a=114577

The new GoT S5 trailer got premiered via IMAX and there are now crappy videos of it doing the rounds. Still, enough to tell that (a) it has a terrible Heroes cover/version as a soundtrack and (b) it looks like we're going to be entering fully unbooked territory.

Or else GRRM told them all he's doing and we're going to be spoiled. :-/