Do you guys see what I think I see? 🙂 (turn to p.175 of the bgb for a big hint)
At this point the only real guessing game is the exact timing of a Dark Eldar release. Very recent chatter is now pointing to a tossup between the Dark Eldar and….
wait for it…
Grey Knights as the next Fall 40k codex, with conflicting reports on both sides! Note that the Storm Raven entry in the Blood Angels codex mentions the Grey Knights by name as its other main user, and it would make a lot of sense for Games Workshop to make sure that the Storm Raven kit gets tied into a strong Marine release slot to maximize sales. Its very possible that if the kit wasn’t ready in time for the Blood Angels, the Grey Knights would do just as well.
~Consider this yet more evidence that the Dark Eldar are well underway and in the production pipeline. Standard caveats on that Dark Eldar vs Grey Knights ordering stuff. Time will tell.