The six-issue spin-off series will be called "Cinderella: From Fabletown With Love" and is due for release in Fall 2010 (I'm guessing the title is an homage to the old James Bond film "From Russia With Love".)
If you don't know about the Cinderella character a la Bill Willingham style here's a description from Newsarama.com:
While the Fables version of Cinderella seems innocent enough, running her tiny shoe store on the streets of Fabletown in New York, she has a secret that doesn't seem to jibe with her immaculate wardrobe and perfectly applied lipstick. Despite her "day job" as a divorced princess who sells shoes, she is secretly a super spy whose well-honed sleuthing skills make James Bond look like a pansy.(You can read about the Cinderella character from the Fables world HERE in Wikipedia.)
While the "Peter & Max" novel details more of the Fabelstown universe and expands on it in a way Bill says he's been unable to do in the graphic novels, the Cinderella series is more of a stand-alone set of stories. Here's a quote from an interview with IGN Comics to help explain in Bill's words:
IGN Comics: I also wanted to get into the Cinderella mini-series that starts in November. Cinderella has always been the secret assassin of Fabletown. How is she going to function now that Fabletown doesn't even exist? Is there a significant change to her mission now?
Willingham: Well, you're right. Cinderella is an assassin. I suppose that's fair. I sort of think of her as the James Bond of Fabletown. If you have a dirty little thing that needs doing and you need it kept off the books and off the record, she's the one you send out to do it. Her story starts when the Fables are still in Fabletown. I don't want to give away too much of the story, but what we've done is sort of written her out of the Fables storyline for the time that this special mission takes place. She's pretty much on her own. She gets involved with Fables outside of Fabletown and starts uncovering all sorts of dastardly things that may be important to Fabletown, but not necessarily tying into current storyline.
...The one thing about Cinderella stories that seems to have shaped up here is that she's okay on her own. You don't just make her one amongst a large cast of Fables. The stories we tell about her are basically that she's this resourceful weapon you can fire at a problem and know that she'll take care of it.And here's a quote from the Newsrama interview with Chris Roberson who is the main writer Bill Willingham chose to work on the mini-series:
CR: I probably can’t say too much, but what I can say is that Cinderella: From Fabletown With Love is about spies, sex, and shoes; that we find out what happened to Cindy’s Fairy Godmother, and that Happiness isn’t always forever after; and we once-and-for-all learn the burning question of who runs Cindy’s shoe store when she’s away gallivanting.You can find the whole interview with IGN which talks about "Peter & Max", the Cinderella mini-series and more HERE, and the interview with Newsrama HERE.