I can understand why they don't want to show off too much of an unfinished product.
I understand why they show an extended trailer to the press, it's just a little nod to get better PR and have them talk about something.
I don't understand why the secrecy behind what basically is 20 seconds of QTEs that is mostly the same thing we've seen but with promts. The only thing that looked rougher was the QTE punching machine and ryo hitting air.