Yea, I know, but I deal with that all the time. I merely wanted to let folks know that whether or not this Fiend Folio bit was true or not, you won't have to wait until it comes out (if it does) to see any additional outsiders. Take that as you will...
Well, looking at the linked post, it looks like a B&W copy from a preorder catalog. It would be a pretty elaborate mock, so it's probably legit. The text makes it sound as if the FF will have more details than prior monster books.