Very little is known about season 4 of Sherlock, though creator Steven Moffat has teased a few details on what fans should expect.
目前关于《神探夏洛克》第四季的消息我们知之甚少，但制作人史蒂文·莫法特还是透露了一些粉丝想知道的细节。

Season 4 of Sherlock will feature Sherlock's (Benedict Cumberbatch) nemesis Moriarty (Andrew Scott), who revealed himself to be alive in the season 3 finale.
《神探夏洛克》第四季中，卷福（本尼迪克特·康伯巴奇饰演）的死敌莫里亚蒂将会是核心（安德鲁·斯科特饰演），在第三季完结时，莫娘向世人宣告自己还活着。

Moffat said that he had a plan in place for Moriarty to appear again in the series since season 2, with Scott in on the plan as well.
莫法特表示，从第二季开始他就在寻找合适的契机让莫里亚蒂回归《神探夏洛克》，斯科特本人也在计划中。

Sherlock fans should also expect expanded roles for the show's female characters. Specifically, Moffat referred to Molly Hooper (Louise Brealey) and Mrs. Hudson (Una Stubbs) in a different interview.
《神探夏洛克》的粉丝们还将看到更多女性角色的扩展，莫法特在另一个采访中特别提到了茉莉·霍伯（路易斯·布瑞丽饰演）和房东哈德森太太（尤娜·斯塔布斯）。

"A female perspective on that friendship and on that man is incredibly telling, incredibly illuminating," Moffat said. "So we've expanded hugely the part of Mrs. Hudson [played by Una Stubbs] because she didn't speak in the original. And we brought Molly in."
莫法特表示：“从女性视角去看卷福华生之间的友谊和福尔摩斯会非常生动非常有启发。所以我们打算扩充哈德森太太的部分故事，因为她在原著中戏份不多，我们又加入了茉莉的角色。” 

Moffat suggested that Molly will be a part of the fourth season, saying that "every time we bring a woman into Sherlock, it works hugely well."
莫法特表示茉莉还会继续出演第四季，他还说：“每次我们为《神探夏洛克》加入一个女性角色，化学效应都会非常棒。”

Fans may have to wait a long time to see the fourth season of Sherlock, much like every season. Moffat said after the season 3 finale that it's possible that the show won't be on the air again for another two years, much like the first season's debut in 2010, the second season in 2012 and the third in 2014.
粉丝们可能还要等很长一段时间才能看到《神探夏洛克》第四季，就像之前的每一季一样。莫法特表示在未来两年内《神探夏洛克》都不会可能会回归，就像是2010年的第一季、2012的第二季和2014年第三季。

Sherlock season 4 does not have a set premiere date yet, but it is expected to air in 2016.
《神探夏洛克》第四季首播时间未定，但有望于2016年回归。