No its not, its exactly what the fans want. You haven't realized it yet, Dumbledore didn't come into the book with a full back story. Fans have bits and pieces of it, but as it stands, Dumbledore is still a relatively mysterious character, despite being a major character for 7 books. Heck, we didn't even know he had a brother until the 7th book. Major fans have always wanted to know more about the headmaster of Hogwarts and Rowling is giving them that.
That's not really a good point at all. People want a fully developed fitting background to the character. Remember how well Metroid Other M handled this?
Imagine they decide to add a more proper background to Mario.
Say he's now a preverse, rapist who hypnotised Peach. Now Bowser's actually a hero, but we actually see the world from Peach's dellusion. Bowser's actually Link. But to her, he's a dragon/turtle thing to her. When he shoots fire balls, those are the lasers from Link's sword.
When you kill a Goomba, you're actually stomping on cats, wich Mario is highly alergic to.
Sounds like great background story, right? Hell, all we need to do is get Shigeru(wich I know he wouldn't because he's not evil) say this is true and there you go, official canon no matter how stupid or out of place it is.
We as fans want to know more about the characters, but not something you half ass throw out that doesn't have any ground. I really don't care that Dumbledore's gay, but honestly, the fact felt really out of place. "Guess what everyone, Harry's left hand gets cold in Winter more so then his right hand"
Not to mention, I gotta agree, if it's not in the book/movie/game I don't care.
According to official manga's, Link has not only been friends with Zelda since they were kids, but he also has an apple orchard where he spent the rest of his life with Zelda there and his parents died in the dark world Ganondorf was banished to.
Oh, and there's a girl who has a crush on Link and follows him around but it never goes anywhere.
The worst part of accepting what the 'creator' says is canon after the official story is done and out, is they could come out and say that Dumbledore was actually Sousuke Aizen and you'd have to accept that as canon.
George Lucas is a good example of why fans don't want the creator to give half-assed back stories.
Apparently Darth Vader was a kid who became a psychopath as a teenager and angsted a lot.