"Agent" Still in Development says Take Two Interactive
During a fiscal earnings conference Take Two interactive confirmed that Agent is still in development so don't lose hope yet for this game. The game itself it based during the cold war era and set to embark players in world of espionage.
I don't think this game will have a preview at E3 now that we know its still in the development stages. But at least we know its still in existence and that is good enough for me. There use to be an odd theory that "Agent" was some how a codename for GTA 5 but this was never proven.