Yesterday, we caught wind that Benedict Cumberbatch and Martin Freeman’s upcoming Sherlock special would finally deliver a full trailer, and deliver it has. Sherlock and Watson at last return to the Victorian era, but when can we expect them to return to TV screens? The mystery deepens …

Curiously, The BBC have yet to set an official premiere date for either side of the pond, only noting that the Victoria-era special would be “Coming Soon,” according to the dimly-lit trailer. Still the new spot goes far further in-depth than what we saw at Comic-Con 2015, offering looks at returning favorites like Lestrade and Mary Watson, new characters, and a whole host of dark and dreary cult-like mystery.

When last we heard, showrunner Steven Moffat had plotted through a potential fifth season of the series, while the fourth was projected to shoot sometime in 2016. Along with the surprise resurrection of Season 3 finale “His Last Vow,” Moffat also specified that Sherlock Season 4 would likely see increased roles for the women of the series, particularly Molly Hooper (Louise Brealey) and Mrs. Hudson (Una Stubbs), potentially adding new female characters into the mix as well, as part of “Sherlock’s gradual humanization.”

We’ll see how long it takes The BBC to deliver a premiere date (executives recently shied away from declaring it a “Christmas Special”), but does the Victorian Sherlock trailer satiate our fix? Might we garner any hints of the fourth season?