Maybe this is already well-known and I missed the announcement but I was reading this interview with Charlie Brooker and they casually mentioned that Jodie Foster is directing one of the episodes for season four.
The official Black Mirror thread (spoilers!) - Page 6
Foster's one is the one starring Rosemarie DeWitt, I believe. Missed Hillcoat was directing one, though.
I do like this interview from Brooker saying that Season 4 won't be "quite as dark."
Surprising no one, but still very cool:
San Junipero got nominated for a Hugo.
Spoilers for season 4, the whole article, basically:
"...the story now has a part in the season finale that we'll get a chance to clap our eyes on later this year, and that the episode will be in the 'White Christmas' format. Called 'Black Museum', it'll have three stories interwoven around a remote Las Vegas museum, where a carny will present objects from a collection."
Also, here's the list of directors:
"Arkangel" - Jodie Foster
"USS Callister" - Toby Haynes
"Crocodile" - John Hillcoat
"Hang The DJ" - Tim Van Patten
"Metalhead" - David Slade
"Black Museum" - Colm McCarthy
All episodes were written by Brooker alone, with the exception of USS Callister, which was co-written by Will Bridges...who also wrote Shut Up And Dance.