Hold your horses, for the first screenshot of Thief 4 may have been found.
The most immediate thing about the snapshot (caught by JeuxVideo) is that the game is presented in third-person, even when a bow is being aimed.
There's also no glaringly obvious 'how dark is it - can I be seen?' icon on the HUD, although the transparent white circle in the middle of the screen could be it.
Eidos is expected to unveil Thief 4 at the Game Developers Conference next week.
A second team at Deus Ex: Human Revolution studio Eidos Montreal will make Thief 4.