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.