Reading on through the list I was wondering how the producers had managed to pack all these stars into one film, and then it dawned on me, this is just fanfic isn't it ? Apparently there was due to be a Fables TV series but right now that project looks dead in the water.
I suppose the problem is that comics with complex plots and large casts don't translate easily to the large or small screen, just look at the hideous nightmare that Hellblazer became when reincarnated as Constantine in the cinema. Of course it didn't help that they cast the world's worst actor in the lead role, but the plot was also a load of rubbish.
Fables has numerous high profile characters, many of whom take prominent roles at different times in the story arcs, and the main story arc of The Adversary wouldn't easily cram into one movie, a trilogy perhaps ?