In a new preview courtesy of TGR, two Bethsoft employees walked them through the game. When they were asked if the game would require a mandatory installation on the PlayStation 3 they answered.
“We do not do that, no. We do the put you know, put the stuff down there that we need to be there, we can stream it on in and out of there but we do not do the ‘we need ten minutes of your time.’” They went on to explain, “We will cache the same way on both (Xbox 360 and PS3) we basically just like everybody you know if you have a hard drive, it does this.”
They are basically saying that it will store information on your disc as your playing, but once your done playing, it is all cleared.