Here is what they released today.
More Dark Eldar models are being released in June and, once again, we're able to offer you an exclusive sneak preview of what's to come... Check out today's Astronomican article for another exclusive image as well as more details on Dark Eldar.
What is it? To me it looks like it might that reclusive Cronos Parasite engine, a Talos, or a Grotesque, but who knows. Your ideas?