Well Konami updated their "next" page, take a look for yourself...
http://www.konami.jp/kojima_pro/next/index.html
The countdown timer is now at 116 hours, and it flashes some different things, the most noticeable being a picture of a younger looking big boss...
It almost just leaves more questions than answers, but my guess right now is Metal Gear Solid 5 will be some sort of prequal?