As we previously posted, it will use the latest motion capture technology so that not only the actor's voice will appear in the game, but 3D models of them as them in character.
SEGA has released pics of Hiroki Narimiya and Kenta Kiritani getting their faces scanned for the game. That "latest motion capture tech" is a scanner from Cyberware. More info here!
セガ、PS3「龍が如く4 伝説を継ぐもの」正式タイトル決定！キャスト第1弾も発表 [Game Watch]