It sure seems like it.
According to the RadioTimes, Benedict Cumberbatch said:
“We’ve agreed to two more series but I could get into trouble for saying that,” said Cumberbatch at the South Bank Show Awards this afternoon.
“All I know at the moment is I’m doing these three and another three.”
We know the “these three” is the Series 3 we reported on yesterday. So “another three” pretty much translates to Series 4. Cumberbatch also seems perfectly happy to keep going as long as Moffat and Martin Freeman are game as well.
“It just depends on Martin and I’s availability, how long we can keep it going. It depends on Steven’s ability. I’d love to keep it going.”
Personally, I know I’d love to see it keep going as well. So glad Benedict Cumberbatch and I have something in common
(via Radio Times)