Originally announced in May 2009, development of the much-anticipated sequel to 2004's Deadly Shadows is being approached in the same way as Deus Ex, another cult property recently revived by Eidos, meaning it'll offer a mixture of new features and classic ones.
"We have more international staff working on Thief, which brings a great flavour to the game," D'Astous told the site. "There are a lot of challenges to bringing back a great cult IP, but we consider it like a new IP and we are going to respect the spirit of the franchise like we did with Deus Ex.
"Deus Ex was the kick-start of this new series of great games, and Thief will be part of that, and Thief will be part of that. We don't want to deliver the same each time. Our mandate is to bring new stuff to the table; games that we'll be talking about for years."
Listings on developer CVs spotted in January suggested Thief 4 will feature some sort of online component and utilise Unreal Engine 3.