Perhaps they're making us wait and foam at the mouth like this so that when they do finally stick us with a not-quite-comfortable UK price, we'll lap it up just the same and feel grateful it finally got here at all ! heh.
This sounds possible to me!
I still think, however, that they will wait and see how the first weekend of sales works out in the USA, then they will allocate a presale/release date for the next batch accordingly. If sales in the States go super-well (which I think they will), then we could see a delay to the UK release.