No, the rep will not be named, but this is pretty concrete. Speaking to a Konami rep at an undisclosed distribution meeting, I was told, after a lot of nagging, that yes indeed MGS was in development for the 360. The rep stated that Metal Gear Solid will be released for the Xbox 360 between 12 to 14 months after the PS3 version hits shelves. This is not a rumor.
I contacted Microsoft's own John Porcaro via email shortly after I spoke to the Konami rep to see if I could get anything from Microsoft's public relations team. Below is the response I received. Needless to say it's the most I've ever gotten out of MS PR team member.
"Thanks for the heads up, [name removed]. For anything that resembles any shift in strategy, or product announcement, or even news of something happening with a third party, we're always going to stick with "we haven't announced anything about " Every day we see rumors, most false, but some true, and we can't confirm/deny everything out there for any number of reasons.
I appreciate the note. I certainly will share everything I can, and I'll often rattle enough cages to get to an acceptable answer. In this case, there's really nothing we can say other than the obligatory "no comment.""