Madoc used to be a pirateAs Tony said they've previously all changed their forum avatars to fit a theme (Astronaut and Clown if I remember right) and this time it looks like the flavor of the month is Game of Thrones. I wouldn't try to overthink it as more than an amusing group comedic effort to celebrate the greatness that is the recently resumed GoT
(Please don't respond with a spoiler.)
Word!While our avatars changing is beyond question a momentous event, this should probably be moved to off-topic.