Man! I really thought (think?) it's Quentin. If you watched the little clip of the Carver talking into the camera after the show last night (I don't think it was the official previews for next week's show, but my TiVo cut off before any other previews were aired so maybe it was) and listened to the cadence and style of the voice (obviously the voice itself was not recognizable), to me it seemed completely obvious it was Quentin talking. Just the way he runs words together, or doesn't, and the pauses and stuff, seemed exactly like the way Quentin talks.
BTW, I called Julia's mother being alive immediately after she heard about the plane crash. Even throughout all the drama of finding her "mom" and the pillow and all of that, I was pretty sure the Mom would turn out not to have been on the plane at all. At first I thought she was not contacting Julia as another stupid "lesson in life", but I guess she just couldn't get through for whatever reason. Makes me wonder yet again: what happened to the invisible daughter?!?!