At long last we finally have some pictures of the rumoured Adptus Mechanicus from Games Workshop on darogscompany. The description of a sentential on four legs is spot on. I must say the little Adeptus Mechanicus guy is more impressive though. Go have a look here.

http://darogscompany.blogspot.co.uk/2015/03/adeptus-mechanicus-pics-and-rules.html