I haven't seen the promo nor the episode, but this anime sounds like a good one to check out...

just a note on the 70% thing you've been complaining about, it seems to me that they might be reffering to fist of the north star anime. in the earlier episodes (the tedious arc of hunting down shin) Kenshiro used to say that people only use 30% of their body, and that Hokuto shinken is about using the rest of it. just a thought, not sure if it's right or not.