Metal Gear Rising: Revengeance has a release date: 21st February 2013
The date came at the end of a new video (below), and was also tweeted by Metal Gear creator Hideo Kojima - he shared a picture of the date on a placard at Gamescom.
The 21st February 2013 is a Thursday. That's the day when games are released in Germany, which tallies with the date being aired at Gamescom. Given that, you can probably assume the AUS street date is 19th February but we'll look for confirmation on this and update in due time.
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Metal Gear Rising: Revengeance is the hack-and-slash spin-off being made by the incredibly talented Japanese studio PlatinumGames