HBO sent a message to Winteriscoming.net concerning this:

Your readers may be interested to know that the 15-minute presentation GAME OF THRONES ICE AND FIRE: A FORESHADOWING will debut SUNDAY, FEB. 9 at 8:45 p.m. (ET/PT), exclusively on HBO, just before the debut of a new episode of “True Detective.” Offering a look back and a look forward to the fourth season of the hit HBO series, the show features clips from upcoming episodes, behind-the-scenes-footage, interviews with talent, and cast members’ answers to questions posed by fans.

This should be a nice treat. I wonder what they could be showing. I can never get enough of all the Behind-The-Scenes footage that they publish. Perhaps some new excerpts from Season 4 although we have gotten plenty of those already. Make sure to tune into HBO on Febuary 9th for 15 minutes of gold!