The script has been optioned by Warner Brothers (who beat out Disney…interesting, since Disney-Hyperion is the publisher) and has the same team that made the Sisterhood of the Traveling Pants movie working on it.
A change will happen, though. They’re turning Kat and her gang into people in their early 20’s instead of teenagers. Does this mean it will be a more mature-themed movie?
Edit: If you look at the acting pool for the early 20’s versus the teen range, Kat behaves more like the 20-something roles than the teen actors. Also, there are bigger names at the 20-something age range right now. Finding one teen actor to pull off the role of Kat wouldn’t be too tough, but to find people for her whole crew would be a challenge. (Think about the cast of Glee and their real ages.) Let’s just say a reliable source clued me in.