Just people getting ahead of themselves. Things like calling her a psycho, a crazy-pants, a vicious killer. That who she's been up til now was all a lie.
I hope that when she does fight, it'll be the most beautiful of displays and not a betrayal of her character.
For those who were wondering, here's a quick note on what happened: Unohana is revealed to be the first "Kenpachi", and her full name is actually Yachiru Unohana. As for the picture, it's just as what Steak says.