Netflix has released some new trailers for upcoming episodes of 'Black Mirror', though it hasn't announced when they'll actually air.
Here's the first, for an episode called 'Arkangel'. This one is directed by Oscar-winner Jodie Foster. In it, a mother briefly loses her daughter, and so tries a new type of tracking technology called 'Arkangel'. No prizes for guessing if this makes things better or worse.
The other is 'Crocodile'. It stars Kiran Sonia Sawar as a doctor who's trying to help a man dredge up memories of a car crash using a machine.
It looks like the fourth series will raise the same ethical questions about technology that the first three did so effectively.
According to Charlie Brooker, series four's release is "imminent", though there's still no official word on the matter. Netflix didn't include it in its programming list for December, so we might have to wait until next year.