Of the new build? They really haven't. They haven't shown single player since E3, where they had one trailer and no gameplay. Gameplay on one multiplayer map with zero details was shown at X018.
I'm British and I don't care at all about Doctor Who either. It's just weird to me that a British developer is promoting their game with someone who is only famous in one country, albeit the largest gaming market. Literally never heard of him outside of Crackdown 3 marketing. Would have been better to use one of the Black Panther actors, if that had been out when they started marketing it.