Lucent
Member
Not sure about costumes, but Mikami confirmed in a previous interview the game has unlockables, and that he specifically mentioned 'bigger guns' after you've completed the game.
I hope there are extra modes or something interesting besides just playing through a 2nd time on harder difficulty (which I will do. I want to complete Akumu mode =D)
But the bigger guns sounds cool. Probably be like RE4 where you unlock stuff you shouldn't have had otherwise. lol