So I've been following LCGs pretty obsessively since the first Netrunner Core Set and Arkham since day 1. The trend I have noticed is that when a product moves from one status to another everything in the same cycle moves as well (meaning when the deluxe moves from on the boat to shipping the first pack moves to on the boat, the second one moves to at the printer, etc). I have also noticed with Arkham that the print on demand stuff is haphazard and has no real schedule. Novels have been shipped out the day they were announced, missions have come out months after they were supposed to, Labyrinths of Lunacy was announced almost a year ago and we still don't have it. So I would say no safe assumption can be made about Return to the Night of the Zealot or Labyrinths of Lunacy. They could release tomorrow or next year for all we know. As for the next deluxe... The first pack "went to the printers" 3/19. Arkham stuff usually moves on Thursdays and when it doesn't it usually follows schedule as though it moved on the following Thursday. If the deluxe went "on the boat" that Thursday (3/22) I suspect it will come off the boat 5 weeks later on 4/26, and be shipping for two weeks. That realistically puts us at probably 5/10 release date for the deluxe.
This is all speculation on my part of course, and I understand that the statuses don't actually mean anything behind the curtain, but they do tend to work like clockwork in most cases. This is just weird cause FFG is still keeping us in the dark by not showing the status of our 2 most highly anticipated products. It's probably a sign that they aren't confident of a release date themselves yet on any of it.