From what Lewis mentioned had been trademarked, and previous rumours of a Dr Who dark ride if you do a quick Google search there are a few links. Using the Dr Who Wikipedia there are a few interesting articles, the first is the "Clockwork Droid".
This would fit in with the teaser image and also the "Chronicles of London" trademark. They were also androids which could fit in with the Automaton trademark. In addition there is an article on the site for "Automatons" although with the definition of the word being "a self-operating machine" it is quite a general trademark.
I could be putting 2+2 together and making 5 though!