This is not a drill, guys: there is a new book written by J.K. Rowling available right now. You can have it on an e-reader, even, in a few seconds.
The book's true author was revealed by a couple of independent linguistic experts, Peter Millican from Oxford and Patrick Juola from Duquesne University, who were commissioned to JKR's published books as well as The Cuckoo's Calling and some other detective books through a program that could detect similarities.
At least, that was my rationale for metaphorically behaving like a petulant child when JKR revealed she always thought Dumbledore was gay. I was horrified at the liberties she played with characters who had already been written and finalized. He was a complex character, but she reduced him to a tabloid headline. Plus, Dumbledore is very old, and it's just rude to speculate on an old person's sex life, thank you.
But now that I'm all into fanfic and everything, such tender (and logically questionable) sensibilities are out the window. Let's dish, sez I. Her fill-in-the-blank interviews provide more depth, as well as a glimpse at her tumescent imagination. Fan fiction writers have imagination too, in abundance! They take JKR's back story ideas and run with them, or create fantastic new dimensions. It's all in the same vein.
Hope this makes sense, because I'm late for work and can't spend more time on this mess. If it doesn't make sense, then you can re-imagine it, 'cause hey, once I hit 'post,' it's canon.