For Amazon (UK), if you don't pay for next day delivery, even for pre-orders you are at the mercy of their workload.
Sometimes they get it you to you on release, but expect day or two after if you choose free super saver delivery. Their delivery estimates are usually fairly accurate - when you ordered it would have said estimated delivery/despatch to be after release date. If you get it on release day from them using super save then you're lucky.
In future if you want pretty much guaranteed release date delivery use Game. (and do it via www.quidco.com rebate site while you're at it.) I cancelled my Tesco pre-order and ordered from Game today and it's already been despatched.
edit: spelling, blah.
Edited, Sep 22nd 2010 1:10pm by Kreisash
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