This is not confirmed yet, but multiple sources are claiming that Emma is currently shooting a BBC 1 TV drama called The Miniaturist.
The production company has neither confirmed nor denied yet, but I'm 98% sure this is really happening.
The show is a 3 one-hour episode miniseries, and is expected to air sometime this year.
Here's some info on the plot and the book it's being adapted from:
Petronella (Nella) Oortman, a poor 18-year-old girl from the Dutch countryside, arrives at the Golden Bend home in Amsterdam of the wealthy merchant Johannes Brandt, who married her a month earlier. She steps into a house of secrets held by Brandt's ascetic sister Marin, the servants Cornelia and Otto, and Brandt himself, who treats her more like a friend than a husband. Brandt gives her a wedding present of a dollhouse designed to look like their nine-storey home in miniature, and she engages the services of a local miniaturist to add realistic furnishings to it. The miniaturist, whom she never meets, begins sending her lifelike dolls and furnishings that are eerily accurate and even seem to predict the future. As webs of danger close in on the characters, Nella wonders if the miniaturist holds everyone’s fate in her hands.