HBO has released a teaser trailer for Game of Thrones Season 4 on YouTube. It's not the full trailer, which is set to premiere tonight (Sunday, January 12, 2014) at 8:58 PM ET on HBO. Instead, it's just a sixteen second teaser of the actual full trailer. HBO is saving the full trailer to get viewers to tune into True Detective tonight, which airs right after the Game of Thrones Season 4 trailer premieres. We've embedded the teaser trailer below, and we will add the full trailer if HBO releases the trailer online after it premieres on their network. Based on the bestselling fantasy book series by George R.R. Martin, Game Of Thrones is an epic story of treachery and nobility set on the continent of Westeros, where summers and winters can last years, and only the lust for power is eternal. Game of Thrones Season 4 premieres on April 6, 2014 at 9PM ET on HBO.