There is a new leaked pic out, that has been making the rounds, a new Apocalypse Warzone: Battle for Iyanden. While this looks legit, with some of the new artwork found in the Tyranid codex.
The one thing that sticks out for me on this, is that the artwork that is shown above is from the new Tyranid codex previews that we saw earlier today when the digital previews went live.
Consider this a rumor until we get something official.
Here is the link to 4chan where the leak is found.
http://boards.4chan.org/tg/res/29282262
via leakshop on 4chan
-War Zone The Battle for Iyanden
-Hirpophant / Viciator (aka. Big Bug)
-Zoanthrope / Venomthrope
-Pyrovore / Biovore