If you'd play the first and second installment then you should be familiar with this third installment that's coming out soon (Japan version is already out). What I want to highlight is the extra mission.
If you had done with the main storyline of the game, you can go to Japanese PSN and download the extra 3 mission for a minimal fees. It is the sub-story about the main character. I'm not sure if U.S. version will come together with the package or not, but this is one of the game that you would not want to miss. Pre-order is available here.
Do check out my Youtube video for that 3 extra mission and the main game as well.