Just picked up this article from Joystiq.com. It says here that Metal gear solid 4's producer, the great Hideo Kojima had to take out a few features from the final version of the game so that it could fit the PS3's blu-ray disk. For folks who are not aware of the format, blu-ray boasts a whoppin 50GB storage already. This means that the game's going to be freakin big and there's going to be at least 2 hours of in-game videos. This also means that nonPS3 owners can say goodbye to ever seeing this going to their systems.
49GBs and counting