As of now, there is no officially declared supplementary installment of the "Project IGI" series. The original Project IGI: I'm Going In was released in 2000, followed by its sequel IGI 2: Covert Strike in 2003. Both games are well-regarded for their tactical first-person shooter gameplay, emphasizing stealth and strategic planning higher than reachable action.
There have been rumors and occasional unofficial reports higher than the years just about a potential new "Project IGI" game. For instance, in 2019, Toadman Interactive, a Swedish video game developer, announced that they were on the go upon a new gate in the IGI series titled IGI: Origins, intended to be a prequel to the original game. This commercial generated considerable ruckus in the midst of fans of the series.
I.G.I.: Origins is set during the cold proceedings and promises to support the tactical, stealth-based gameplay that defined the earlier games. The enhancement has been relatively quiet, past periodic updates hinting at ongoing progress. Fans are eagerly awaiting more definite information, such as a liberty date or detailed gameplay footage.
For the latest and most accurate information, it's advisable to follow recognized announcements from the game's developers and publishers. They will present verified updates vis--vis the improvement status, freedom dates, and extra valuable details.