Originally planned as an interquel between MGS2 and MGS4, that has officially been scrapped as Metal Gear Rising takes a new subtitle. The game, known now as Metal Gear Rising: Revengeance, actually takes place after the events of MGS4, where Raiden is one of many cyborgs. This change occurred when Platinum Games officially entered the fray of development.
The game takes place in a civil war-torn nation as Raiden is dropped in without prior knowledge he will face cyborgs. Platinum has also stated that the stealth elements of the game have been dropped in favor of a pure action experience.