News about Thief 4 is difficult to come by. We do know that Eidos Montreal is apparently the studio that is working on the title; and if recent chit chat is accurate, they have the first trailer for Thief 4 ready to show the world. It is really a question of how soon.
 
From what we are hearing, the plan is for Eidos to show off this Unreal 3 Engine-powered title at the next big gaming event. Then they will officially announce the game and show you the trailer. The game is believed to offer both a single player and a multiplayer experience for the Xbox 360, PlayStation 3, and PC.

The Thief series of games continues to be worshipped as one of the best PC classic games that have made its way to the current generation console market space.