Eidos Montreal has finally confirmed Thief 4 on its studio website.
"We're in the early development stages for Thief 4, but this is an incredibly ambitious project and a very exciting one," writes Stephane D'Astous, general manager.
"It's too early for us to offer any specific game details; right now we are focused on recruiting the very best talent to join the core team at the studio and help us make what we believe will be one of the most exciting games on the market."
No platforms nor dates are mentioned, although PC, PS3, Xbox 360 and "2010/11" are likely.
Thief, a stealth-action series, casts players as a nimble assassin who must creep through the shadows and use an array of sly tactics to achieve varying mission goals. The original was one of the best games of 1998, as our Gold Edition review mentions.