Steelshanks is an armsman in service to Roose Bolton. On his CV, Michie lists “Various” under directors, which means he will appear in at least two episodes. His IMDb listing has him appearing in episodes 7-10, however IMDb isn’t always accurate. At the very least, we know that Steelshanks will be a recurring character.
Winter Is Coming: Thanks to Carne who first spotted this one. Assuming that Steelshanks fills the same role he did in the book and assuming that his IMDb listing is correct, than this casting gives us some clues on where they will cut off a certain storyline.