Sherlock season 4 is expected to air in early 2017.
As an early tease of things to come, the BBC has released the first promotional still from Sherlock season 4, which shows the dogged detective teaming up with a canine companion.
There’s never going to come a time when we do a longer run, because this is what the series has become.
I thought that once they had become extremely successful, we would only get to do one more series.