I read the same thing. FOX has agreed to let Joss do whatever he wants with the show as long as he maintains the same audience as season one. So far, the show has a definite 13 episode order, although FOX has been known to cut down orders due to feeling-like-cancelling.
Yes, that's what I meant, Michael, Fox tend to just axe things even after they have given them the green light and if the ratings don't hold up, I was concerned that DH might be a goner. Plus, Fox, like everyone else is having major financial troubles and are making cuts in a lot of areas. I hope DH holds up though!