JK Rowling is writing for adults... ooh-err!
On behalf of all adults (can you really say that, Roobin?) I'd just like to say, please don't. Honestly, we've got enough books already. They're really good ones too; Ulysses, Moby Dick, Nova Express, Heart of Darkness, Homage to Catalonia... all good (someone else might want to name some more). Just... you know... are you sure about this...?