Most info is on TW Center page, but factions are:
Stark, Martell, Greyjoy, Tully, Arryn, Frey, Lannister, Tyrell, Baratheons of: Dragonstone, King's Landing, Storm's End (so Stannis, Joff, Renly). Unplayable (for the moment) Nights Watch, Wildlings.
It will be released this year.
Source: I'm the team unit maker!
Murfmurf
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