Thief's Garrett will be played by Romano Orzari in the game, according to a new community video from Eidos Montreal. As reported previously, the original voice actor Stephen Russell didn't reprise his role as full performance capture was implemented into the game. Can't say it was a bad choice, in my opinion anyway, plus you may recognize him from Assassin's Creed 2 where he voiced Giovanni Auditore da Firenze. He also played him in Assassin's Creed: Lineage, the live-action video series.
Thief is out next year on next-gen consoles and PC.