Been waiting for this game for some time now as I loved Super stardust HD which was like the first game I bought from PSN I think. Good news is that it should be out on 1st December for £9.99 bit more expensive there stardust HD but I reckon it will be worth it plus it has co-op!
http://blog.eu.playstation.com/2010/11/15/the-zombie-apocalypse-is-1-december/
http://blog.eu.playstation.com/2010/11/15/the-zombie-apocalypse-is-1-december/