Sony has confirmed that there will be no install required before you fire up the mighty God Of War III.
Coming via the way of the Twitter, Christer Ericson, director of tools and tech at SCE said, "God of War 3 does NOT do a HD install. The 5MB listed on box back is for save game only."
That's all good as long as they don't do a Bayonetta and add an install option later on because everybody complains about loading times...
Sony also confirmed that the European version of God Of War III fills over 40GB of Blu-Ray disc space - taking full advantage of the multi-layered format.