This is just an idea for fun's sake but if you had to explain it simply think of the more primitive primal and experimental forms of Druid Magic similar to what created the Worgen. What if there was a "Were-Bear" Form that stood on two feet?
Just curious what you druids think? Would you support a glyph that would make you tank face to face instead of Nose to foot? Or possibly a quest similar to the Warlock's quest to unlock Forbidden Druid forms from the sealed away in the Nightmare?