Yeah, but we don't know anything that's going on behind the scenes with Konami. Sony could have a gag order on them, but eh, I don't want to jump to conclusions.
Now, I hope it does make it to 360 because I love MGS and I really hope it reaches as many people as possible, especially those who may have missed out on the previous games or those who want to play it but have a 360. I wish I could say the same for some of my fellow PS3 owners/fans, but a lot of them are selfish morons who want every game to themselves.
But part of me hopes it stays on PS3.