Just Kids on the Big Screen

I just read that my favorite novel of last year, Patti Smith's Just Kids, is being turned into a feature film and Smith herself is working on the screenplay. I am totally one for a biopic, especially if it has to do with rock n' roll (which they usually do), and although I am not always into movie versions of amazing books, I think this one could be up there with my fave the Virgin Suicides. It gets me excited just thinking about it, like most things having to do with Patti Smith somehow do. Who do you think they will cast as those two icons above?