I just visited a new GW and the store was awesomely friendly, unlike my usual GW employees this guy knew quite a lot about the new DE and he told me preorders would appear in 10 days...
Flyer for certain (no clue if it's 2 in 1 or just 1), talos/cronos, full plastic like the rumors say, he didn't know much about wracks or grotesques though, but more models will come, he just didn't want to tell me more, he told me: wait 10 days and you'll see.