Konami announced Metal Gear Solid: Peace Walker as a 2010 game. That could have meant December 2010 or summer 2010. No, Metal Gear Solid: Peace Walker is arriving in Japan much sooner than that.
As revealed in this week’s issue of Famitsu, Metal Gear Solid: Peace Walker is dated for March 18, 2010. No news about the Western release date, but Konami tends to time international releases for Metal Gear Solid games close together.