HMV's Xbox 360 MGS 4 listing was a mistake
"In his enthusiasm, one of our online games team indicated that hmv.co.uk would start taking pre-orders for MGS4 on Xbox 360, when, in fact, he simply meant to ask customers if they wished to receive an alert in the event of this title one day coming out on this platform."
So, there you have it. It was a simple admin mistake and now we know that the retailer didn't have any insider's information. We guess it's time to restart our countdown clock and wait patiently until the next "MGS 4 is so headed to the 360" rumor surfaces. We'll give it another two days.