In this months issue of EGM's Rumor Mill, Quarterman reported that Konami is developing another Metal Gear game for the PSP. Apparently it isn't going to be a spin off such as we've seen from Portable Ops. The new title is said to "Hearken back to the early days".
Could this be a new business model for Konami? It seems the Japanese development house has taken a keen interest in portable development of late. With the launch of Portable Ops Plus, and Silent Hill Origins all in one month. It seems Konami seeks to fill in the gaps between their triple A titles with portable games.