My only question with the Decimator is with its Daemonic Possession. Forgeworld listed a BS 3 so daemonic possession should lower the Ballistic skill of the walker down to 2, which would suck, or is possession supposed to included into the profile of the walker. (I have not gone back to check the codex)
Here is the link to the new rule update
http://www.forgeworld.co.uk/Downloads/Product/PDF/d/Decimator_mk2.pdf