Found it on the last day of the beta; genius. The guy who did that did the World Of Colour one which was pretty cool too. Gutted I missed the Mirror's Edge level though.
I think it said on PS3fanboy that its an open beta that anyone can download between Apr 17 and May 6th. After that its being taken off the store. No pre-order codes needed.
They've printed the press release that confirms this on the "semi-offical" European blog threespeech ( http://threespeech.com/blog... so I'm confident this is true.