Konami says MGS4 on 360 is just "Speculation"

[Bodhesatva]

Blue3 said:

Use your brians.

Kojima does not do ports, hes only working on a PS3 version.

So once MGS4 is out for PS3 it will take Konami minimum 6 month to a mediocre port, and by them it wont matter.

I think this is the most likeliy scenario. I actually think it will be more like a year, personally, but 6 months is obviously plausible :p