Unfortunately due to the excessively adult nature of the show we're very unlikely to get it. Which is a shame as there is an absolute wealth of characters that could be in the game, so many well known. It'd be the perfect franchise to be a lego game if it wasn't for the nudity and violence associated with it xD.
The contrast of the game with it's family friendly lego humor and the super serious show would be hillarious though. Can you imagine the Red Wedding scene in Lego, or Ned Stark's execution with the typical lego gags thrown in! Amazing!
Oh... I didn't thought about it that way but you are totally right, maybe they could tone down a lot the violent scenes as they already do and get rid of the sexual ones. Or just make a "mature" Lego game for the first time, that could be a hit among GoT fans.
I don't see it happening but it would be a ton of fun if they made it as good and charming as this one but with all the traumatic scenes that we usually suffer in GoT xD