57k? Seriously FF is STILL big in Japan. Impact similar to MGS4 IIRC... Very impressive as for a 30 minute long demo.
BTW I think most people here underestimate K2. I think it will start pretty decent with 60k week one and finish around solid 100k. Yes - it is that good. Personally I think japanese gamers will find Helghast's nazi look really appealing.