A couple tidbits of observation/information: This has not been confirmed by Kojima Productions, however, they had recently mentioned that they would soon be announcing 3 new products for this year. So this is likely one of those three products.
As far as content goes, the only difference between this and the Japan edition are Portable Ops (which you can still easily pick up at the store), The Document of MGS2, and the Metal Gear Saga DVD. Unfortunately, the two latter items are what the majority of people would be most interested as those were limited items when they were first released.
This will almost definitely be a limited package and as such is not likely to be at any places besides video game-specific stores like Gamestop, Play-Asia...Best Buy is a big maybe in my opinion.