Basically, have 15 seconds of a Dalek emotionally manipulating the Doctor.
To be completely honest with you, this teaser trailer trend is getting on my nuts a bit, especially one like this. Teasers are clever marketing because they create waves of publicity instead of relying on the fandom to keep the tension up after a proper trailer has been released up to the series premiere, but really*. Give me something I haven’t seen before, something that’ll make me go, “Oh, I have to see this!”, not the same old “You would make a good Dalek” spiel the Daleks have been tormenting the Doctor with since revival Series 1.
* Perhaps it’s the fact that I work in marketing now and have conversations like that myself every other day…