Kojima Productions Makes Stealth Update at Teaser Metal Gear Solid Site

Maybe my math was off, but the last countdown at the Kojima Productions teaser site was set to reach zero on Monday, no?

Whatever the case, the latest update hit the site today, offering a bunch of new letters, and a new face as well.

This is the character most have assumed to be Raiden.

New letters: P, 0, and 6.

Add all that to the previously released face and letters:

Older letters and face.

Unfortunately, none of this was a surprise, as Famitsu leaks had showed everything in advance.

Except for this:

Click the Kojima Productions logo at the bottom of the teaser site, and you're taken to the above site that's titled "Kojima Productions 'Mask.'"

There's haunting music in the background and ESRB ratings logos. And before you enter it, you have to input your age (rather than the Japanese way of simply assuring the site that you're 18 or up).

The meta name tag for this site reads:

＜meta name="keywords" content="Hideo Kojima, MASK, game, konami, kojima game, KJP, Kojima Production "＞

What could it mean?