The only version of the new Houllebecq novel I can read now is the one in German, Entwerfung., as the English edition does not come out until September. I am about halfway through and can report it is excellent and a fun read as well, most of all when it makes fun of the vulnerabilities and vacillations of the West.
Here is an Anthony Daniels review, with lots of plot summary (and spoilers), part of the last paragraph shows he understands the work:
This novel is far from a crude anti-Islamic polemic, however, as many might have supposed it to be from its pre-publication publicity (Houellebecq has expressed himself very unfavorably on Islam elsewhere). It is rather a meditation, admittedly using all the author’s habitual tropes which fortunately, or perhaps unfortunately, are susceptible to an infinite number of bitterly amusing variations, on the state of Western civilization and what makes that civilization vulnerable to attack…In other words, it is an implicit invitation to us to look inwards, to think of what is wrong with us rather than with them. Whether we or they will read it like this, I rather doubt…
This is one of the novels of the year. Here is a good Adam Gopnik piece on Houllebecq and the book.