In the post Stephanie talks about how excited she is to join the cast and that she could not comment any further due to the popularity of the series. Apparently she had already said too much and the post has since been removed from her site.

There is a list floating around the internet of characters that assumed to appear in the show including: Martian Girl, Aqualad, Impulse, Arrowette, Conner Kent, and Nightwing.

For now I guess we all just have to sit back and wait for Warner Brothers to confirm the series (and of course appreciate the Arrowette image that Stephanie leaked on her blog).