The game is not another sequel, but a reboot.
Originally announced in 2009, under the working title "Thief 4", after rumors of it's development began to surface.
This marks the first time that Stephen Russell does not provide the voice for Garrett. There was an online petition to bring Russel back as Garrett's voice actor, but it did not come to fruition. Eidos stated two reasons for this change of voice actor. Firstly, they said that Russel's voice as it is presently did not match Thief well anymore. Secondly it was that the voice actors now had to do a lot of their own stunts, assisted with motion-capture devices, which again left Russell mismatched to the part.
Revival of the cult classic "Thief" series of stealth games, which it is the fourth game.
"Tenchu", "Assassin's Creed" and "Tomb Raider" are considered possible strong influences behind the video game.