Yeah, so there isn't really too much Japanese about this Hitman Absolution Japanese trailer. But it is a Japanese trailer, as evidenced by the "Extreme Edges" branding at the beginning (that's the brand Square Enix uses for Western games).

Square Enix released the trailer today as it opened the game's official site. I believe the game's Japanese release may have been officially announced just last week when Square Enix shared its E3 lineup.