Nope. Kojima-san worked on Metal Gear Solid: Peace Walker as well. Kojima worked as a writer, producer, and director on the past three MGS games and, luckily and happily, it doesn’t look like he’s stopping any time soon.
The news broke during E3 when Shigenobu Matsuyama, producer of Metal Gear Solid: Rising, admitted that the tactical espionage action game creator might not be done with the series.
That’s a pretty dense statement, but extracting the information from it, it’s a pretty safe bet to say that Hideo Kojima will not be giving up the series he is best known for just yet. The only problem I can really see out of this comes from the fact that, after Metal Gear Solid 4, Solid Snake retired from combat, forever.
So, going from Matsuyama’s statement, Raiden may have his own series of games while (possibly) a new protagonist takes over the mantle of Solid Snake. What could his designation be? They have already done “Solid”, “Liquid”, and “Naked”, what could be left? Will it even be a snake at all? The part that’s hardest about any of this is waiting for Kojima to make a formal announcement. Unfortunately, all we can do is merely speculate as to his intentions.
However, you can start playing the recently released Metal Gear Solid: Peace Walker on your PSP today and get yourself back into your complicated plots, overly long cutscenes, and stealth gameplay mood. It’s also worth noting that you can expect to see a port of Metal Gear Solid 3 on the Nintendo 3DS when it releases (that says a lot of the handheld’s capability).
Source: Shack News