Initially it was supposed to start Dec. 2007 but was delayed due to the writer's strike.
At present it is listed as unknown. It was last updated Nov. 19 2007 so it might be filming. You could try calling the production company and ask the status, and whether they forward fan mail.
This is the listed production company:
Cruise/Wagner Productions
10250 Constellation Blvd.
Ste. 11007
Los Angeles, CA 90067
USA
Phn: 310-449-3777
Fax: 310-586-8727
I don't think this is filming or will be for a while. The film is only announced...also a lot of the cast members signed on are filming other movies at this time or will be starting to soon.
Oliver Stone said a couple of months ago that he still has the rights to Pinkville but he wasn't going to make it at that time. He's now doing a couple of documentaries and then the sequel to Wall Street - who knows where that leaves things
Oliver Stone is actually off the project according to reports and will now be helmed by Jody Hill. I don't know how much truth is in that though. But if it does film I can't see it starting until at least early next year! Seems a little odd for it to start this year when its release is now set for 2011. Just a thought though! I have no real information on it unfortunately.