This has been said already but I'll say it again for good measure, Hideo said that the fifty gig blu-ray disc he was using was not big enough for his vision of MGS4. The 360 uses a DVD disc that only holds 7-9 gigs of data, meaninging you need at least five discs, which is more than a little unwieldy. This along with Kojima's loyalty to Sony makes a port practically non-existant. In addition to that MGS4 is a system seller the same way Halo or Gears is, so the argument that it will be ported because no one has a PS3 loses some of its merit. As for Sony paying of Konami, yeah that's possible, but in given their history it is not likely. It is just not something they do very often, as evidenced by the fact they did't throw piles of money at R* or Capcom to keep GTA and DMC exclusive.