After reading four articles about the new JK Rowling book...
...all I really know is that it's for the adult market, and that Little, Brown is handling it in both the UK and the US. Oh, and that JKR hopes for new readers, and more details will be released later this year, and it will be "very different to the Harry Potter" books.
Seriously. That's it.
If you don't believe me, feel free to see if you can mine more info from Publishers Weekly, HuffPo, GalleyCat, or the NYT.