Hyams on 07 December 2008
Here's the page Google translated:
http://translate.google.com/translate?u=http%3A%2F%2Fblog.livedoor.jp%2Fdigitalbyte%2Farchives%2F305967.html&hl=en&ie=UTF-8&sl=ja&tl=en
I'm struggling to figure out if they're officially confirming it's an iPod Metal Gear, or if it's just speculation.