Since Friday I haven't been able to get my hands On the mw3 shipment in the UK. So I asked when we will be Posting them off, they said Monday.
Activision have put an order on the big retailers, for me Tesco, saying all preorders are to/going to be sent to a warehouse and to be posted on Monday on 1st class for delivery on Tuesday. So don't expect your game coming early if you ordered from the big retailers.
However small game stores have been selling the game early here for an extra price. Call up your local independent retailer to find out if they will sell you one early. Use google maps to find them *cough*kdirectlimited*ebay*london*65quid* they will sell it to you early but at a higher Price, I've decided to wait.