Well this is unexpected. Never thought we'd see Nintendo farm their IPs out for western adaptation again, with how clearly ashamed they are of the Mario movie and the terrible-in-hindsight late 80s/early 90s cartoons. I can only imagine that if this is true they'll be insanely controlling over it, to avoid having that kind of disaster again.
Also: "family-friendly Game of Thrones" is about the most hilarious description for a new show I've ever heard.

