This interview from Cosmo Girl isn't exactly new (it was done after City of Bones but before City of Glass) but it has some really great insights from one of YA's most talented authors, Cassandra Clare. My favorite part is:
I hope the fact that Clary is a smart, strong girl who faces down her fears will make readers think, She gets scared just like I would, but she still fights for what she believes in. And I hope it might even help them believe that they don't have to be perfect to fight for what's important to them.
Click that quote above for the link to the article!