So all that is left is to get Garrett his original voice, ditch stupid "savior" theme, bring back Jump-at-Will way to move, bring back combat that is hard to win with Garrett being vulnerable thief and guards having proper mastery and health, add huge, sprawling non-linear levels, add clever guard AI (and no, I don't mean instant awareness of my position), delete that "run or die" chase scene corridor that was proudly featured in some demo and had absolutely zero connection to proper "Thief" game (and personally I hate chase corridors like those Tomb Raider and Hitman Absolution had), bring back the setting, bring back PROPER rope arrows that can stuck to any appropriate surface and maybe it will become something resembling the Thief.
And add some colors to your world, developers of Thief, please. It is all grey-brown-dark if screenshots are to believe. If I wanted to play world like that, I'd play a modern military shooter.