My goodness!
Following Juan's pointer I went to Amazon and found Krauss book ("the allure of hidden dimensions, from Plato to String Theory") due out 20 october, but I also came across this!
http://www.amazon.co.uk/exec/obidos/...931077-6960601
All Strung Out
by Lee Smolin!
For sale at Amazon.co.UK, the price is 19.15 sterling.
Apparently the publisher Basic Books brought it out on 3 July.