I've preordered mine from HMV Japan - it only works out at about £17.50 including FedEx delivery for the version with the DVD and bonus track. There is a slightly cheaper CD only version including the Japanese bonus track.
Let's face it, HMV stores in the UK would charge you nearly that much if there was a limited edition UK version, nevermind the Japanese import...
I forgot a link for all you good people. Here it is:
http://www.hmv.co.jp/product/detail/2601430