Here is what Cassie has to say:
While I don't have a release date for the graphic novels at this time, I thought I'd share a panel just to reassure everyone it was still ongoing. This is Clary's dream, from p. 57 of City of Bones:
She saw her mother lying in a hospital bed, eyes like bruises in her white face. She saw Luke, standing atop a pile of bones. Jace with white feathered wings sprouting out of his back, Isabelle sit- ting naked with her whip curled around her like a net of gold rings, Simon with crosses burned into the palms of his hands. Angels, falling and burning. Falling out of the sky.
Visit Cassie at her blog: http://cassandraclare.livejournal.com/