does it say its been dispatched on your account? if so you should receive it today by prime. I'm using prime mine got dispatched about 7pm last night and customer support told me i will receive it via royal mail today.
One day prime service (not the express delivery one) means it could be delivered up until 7-8pm on the estimated delivery date. My Fifa 13 was delivered at about 5:45pm on release day via a royal mail van on the one-day service amazon provide.
Its all depends on when you actually ordered it though.
Finds it unbelievable how many people have to play the game within minutes of it being released, even watching out the window for the postman.......I'm getting it for Christmas so I will be looking out for reindeer rather than red vans :-)
tim im sure you wouldnt be happy if you had paid for a service to be delivered on release and didnt recieve it now would you,say father christmas doesnt bring yours on christmas day youd be pissed wouldnt you.
from experience i oredered halo 4 for release day delivery, i paid for next day delivery via courier and got mine on release day but alot of people on those forums had prime and if it is dispatched by royal mail first class delivery you are very unlikely to get it next day, first class isnt guaranteed next day i have family who work for royal mail and its 1-3 days normally, if amazon only dispatched it last night you probably wont get it today if its royal mail first class.