Well, it looks like the "announcement" has been clarified a little bit:

Kojima on Metal Gear Solid 5: “We’ll have to make it at some point” | Warp Zoned

So OPM UK was basically generating a little pre-issue hype, as in the interview Kojima states that Metal Gear Solid 5 is something "we'll probably have to make at some point." Which is kinda good, because maybe now he can focus on whatever "Project Ogre" ends up being. He also said he wouldn't necessarily direct, as he's been really keen on the idea of letting a subordinate create a MGS from the ground up. There's also some pretty interesting tid bits, like how Kojima designed the levels and enemy patrol routes himself in MGS1. That's a lot of work, and I'm always amazed at the game design behind sneaking and clearing levels in MGS1.