Just got shown before true blood 3.1:

http://www.hbo.com/#/game-of-thrones/about/video/winter-is-coming.html/eNrjcmbOYC5Uz89JccxLzKksyUwOSExP9UvMTdUsy0xJzYeJOu fnlaRWlDDns0knlpbkF+QkVtqWFJWmsjGyMXIyMgIAblQXOA==