I've been keeping an eye out for this show as well, and the last I read, Claudia Shearer is now penning the book, and for those Grey Garden Producer hating people...they'll just love to hear that East of Doheny/the Gonda's are producing this show as of now.
I am hoping for a great adaptation of the movie, because the original book is not that great and the Bullocks end up working in a restaurant owned by Godfrey at the end. Mr Bullock is on an island, hiding out from creditors, as well. The book made me love the movie adaptation all the more!
here's a link to the April 2006 story:
http://www.playbill.com/news/article/98887.html
"My dreams, watching me said, one to the other...this life has let us down."