Poor Kojima can't make up his mind. First he said that MGS4 would be his last Metal Gear Solid game, then he hinted that a MGS4 sequel was in the works, then assistant producer Ryan Payton said there wouldn't be a direct sequel but another Metal Gear game eventually would be made, then Kojima restated that he is thinking about making MGS5.
Now he has confirmed that he will be staying on board for the next Metal Gear Solid game, but he won't be in charge of it. Yes, he said "Metal Gear SOLID. According to Kojima: "Metal Gear Solid will ALWAYS be around!".