Below are the best resources for the ASOIAF miniature game:
ASOIAF Kickstarter – The site that started it all. Not the best format to navigate, but has most of the information about the game available in one form or another.
ASOIAF Minis Reddit – This is the best subreddit about the game from a competitive standpoint. Good analysis and community.
ASOIAF Miniature Wargamers Facebook Page – This is the most active Facebook page about the game. It contains regular activity and a good community.
BoardGameGeek ASOIAF Page – BoardGameGeek is a great resource for all tabletop games and this one is no exception. A lot of good information here.