I have also heard of 'wing steak' but only just vaguely. But here is a description I've found that might help some.
"The Wing steak cut is in fact half of a T-Bone steak. Usually formed with a portion of filet mignon and a portion of striploin, the wing steak is stripped of its tenderloin, resulting in a nice bone-in striploin. Already flavorsome, the bone will give an extra kick to your steak during cooking."