The trailer has a lot of great bits in it, but my favourites were our first proper look at Dragonstone in the daylight:
And this shot of Tormund Giantsbane (Kristofer Hivju) climbing the Wall is quite impressive:
Meanwhile, Entertainment Weekly has reported that the second season has sold more than 241,000 copies on its first day on sale in the USA, a 44% increase on the first season. More than 350,000 episodes were also bought from digital vendors, more than twice that of the first season. This bodes well for the Season 4 renewal (which is expected after the first few episodes of Season 3 airs, but pre-production has already started).