Remember COD is the highest profile game launch of the year.
Retailers will be watched with the release of this game, more than other games.
I think shopto and all other retailers were made to wait till Monday to post out the game last year.
Some got it early, but i cant remember where from, maybe GAME?
Basically no one knows, not even the retailers. If they are feeling brave they may ship Saturday for Mon/Tue delivery. Any very early delivers, Fri/Sat and the retailers will get a telling off.
Most i think will post out Monday.
If your so very desperate, the best way to get it early is find a local independent retailer, who will have stock in early and will be willing to sell it 'under the counter' and probably at a inflated price too.