Is this Thief 3 / CoSaS / the Thievery UT modification?
Nope. Thief 3 has been Officially Produced and Officially Released by ION Storm under Warren Spector’s watchful eye… The Circle of Stone and Shadow (CoSaS) is a Fan-Made Campaign that’s being built over at TTLG by the likes of Digital Nightfall, Trimfect, and Mokkis (among others). The Thievery UT Mod project is also Fan-Made, but has more to do with Unreal: Tournament than Thief. “T2X: Shadows of the Metal Age” is a Fan-made expansion pack for Thief 2. Nothing to do with CoSaS (although CoSaS promises to be a wonderful experience), nothing to do with the Thievery Modification, and certainly nothing to do with ION’s Thief 3. They’d hang us if we scooped T3 from them. Really, they would.