In preparation of the fourth season, HBO will be airing an 60 hour Game of Thrones marathon on HBO 2. All three seasons will be aired in this marathon in an effort to get current fans an opportunity to play catch while also attempting to reach new fans of the popular series.  Also announced was an expansive viewer’s guide on HBO.com:

New York, N.Y., April 1, 2014 - In celebration of the highly anticipated fourth
season premiere of Game of Thrones, HBO gives audiences the best way to catch up on
the series when the show takes over HBO2 for a weekend-long marathon that will allow
fans and newcomers alike to watch all three previous seasons consecutively. In
addition, HBO.com will launch the all-new Game of Thrones Viewer's
Guide<http://viewers-guide.hbo.com/>, the ultimate online companion - delivering
exclusive content for every episode of the series, now on every platform including
tablet and mobile.

Beginning on Friday, April 4 at 9:00 a.m. ET/PT, HBO2 will reign when all three
previous seasons (10 episodes each) of the epic series are played back-to-back,
twice, for 60 straight hours.  The final play of Season 3, episode 10, will end at
9:00 p.m. ET/PT on Sunday, April 6, just in time for the Season 4 premiere on the
HBO main channel at 9:00 p.m. ET/PT.

Amplifying the action on the screen, the Game of Thrones Viewer's
Guide's<http://viewers-guide.hbo.com/> fully responsive design features all-new
interactive maps of Westeros and Essos, with three levels of zoom, along with 
character bios from every season, an up-to-date "Guide to the Houses" and shareable
episodic content.

The new Viewer's Guide also includes episodic videos that delve deeper into the
story, including an "Inside the Episode" feature with series creators/executive
producers David Benioff and D.B. Weiss;  "Interviews" with cast members providing
reactions to pivotal moments in the season's arc, with context from author George
R.R. Martin; and video featurettes that allow the Game of Thrones crew to pull back
the curtain on how the show's look is achieved, with intricate details and
photography from the set, including costumes, locations, props and armor.

Based on the popular book series "A Song of Ice and Fire," by George R.R. Martin,
the Emmy(r) and Golden Globe(r)-winning Games of Thrones is an epic series whose
storylines of treachery and nobility, family and honor, ambition and love, and death
and survival, have captured the imagination of fans globally and made it one of the
most popular shows on television.