This fall the PS3 80GB version that is going to be dropped to $399.99. They will be removing the  ps3-controller-ss-1140GB version and the 80GB will have the same functionality as the 40GB version. Thus meaning or what it meant by what they said is that the 40GB version is going to be made into a 80GB with no backwards compatibility. That means that if you want backwards compatibitliy on your PS3, you should get it right now with the 80GB MGS4 bundle!

More information as it is released.