The Sherlock cast was spotted filming at the Coston Hall in Bristol, England, for the one-episode special expected to air on Christmas, 2015. (FINALLY!)
Mark Gatiss commented:
“It’s not a Christmas special. It’s a special, but we honestly have no idea when it might be on. We’re making it in January but we don’t know when it’s going to be on. Christmas would be nice.
Additionally, BBC released a short trailer featuring glimpses of Sherlock as well as other shows.(https://www.youtube.com/watch?v=OP1ZaXgqL94)
The premier of Sherlock Season 4 was generally expected to release in early 2016, however many are now speculating that it is quite possible that it could air in 2017. (Haha fun; another 2-year wait)
However, from what Benedict Cumberbatch has recently said, it appears I could be watching Sherlock for many years to come.
“If we can keep the quality up,” Cumberbatch said in a Vogue Magazine interview, “I can’t imagine that I will ever get tired of being Sherlock. I’d love to play him as an old man.”