i think the 25th in uk is only for the pre-order list, some online stores have a special limited list for pre-orders, if you get into this list right in time, you might get it earlier (on 26th), after the pre-order list is full, the release date will change from 25th to 27th or later, pre-orders are not always the same, some have limitations applied to it, others are just normal orders before the game's release, so the 25th might be such a limited thing, gta san andreas had such a limited pre-order list too and it went full in a really short time, months ago, before its release, .. also some stores might sell it before the 27th, some shops in germany did it with san andreas, but it was not absolutely legal