Happy Aussie bookday!
So today the book is coming out in Australia, as I understand it, so I thought I'd catch y'all up on what we know from the British release: it does seem to be in major chain bookstores, but fewer than ten copies (sometimes five or less) at each store. They do seem to be stocking it in the film/entertainment section rather than the humor, also.
See this entry for info on requesting signed bookplates.
Here is what I intended to be the "everyone who wants to can come here and discuss the book" entry.