No official confirmation by CMON, but this tracks everything we know, so it is probably legit. The only real information about it is HERE! I started a new NW Army Page to track what we learn on the site.
Starter set is said to include two units of Sworn Brothers (13 models each, for a total of 26), one unit of Veterans of the Watch (guessing 12 models), one unit of Ranger Trackers (guessing 4 cavalry models). And these five, which look like Jon Snow, Ghost, Jeor Mormont, Maester Aemon, and Allistar Thorne.