My local ABC shop in Australia has got them in already (less the one I've just bought). Online, Amazon UK are quoting "This title has not yet been released" and the local agent, Random House Australia, are saying 2 November release.
I rather thought that William Heinemann, the publishers, had a reputation as a serious publisher. Not the sort to publish books without a sound background to them. The book seems very properly (and widely) referenced.
Annus Horribilis? - that's this year