...and, er, that's it!
Presumably this monster is set to appear in episodes 5 and 6 of Series 9, which are currently filming.
But what it is, we don't know.
The slot with the red 'eye' looks like it could be a distant relative of K.I.T.T. from Knight Rider. But that seems highly unlikely. Maybe it's the return of the Krotons, redesigned for the 21st Century? Also, highly unlikely.
So any guesses?
What’s that in the shadows? New monster about to meet Peter Capaldi and Jenna Coleman in #DoctorWho Series 9… pic.twitter.com/KEWpK3YiuA
— Doctor Who Official (@bbcdoctorwho) April 21, 2015
Update April 22nd
The BBC released a new image today, this time not in the shadows...
...clearly it's not K.I.T.T.! Shame.