Because both leading actors of BBC crime drama "Sherlock" have very busy schedules, the release date of the next season has become even more uncertain.

The modern television adaptation of the Sherlock Holmes-Doctor Watson books has captured the attention and interest of millions of viewers worldwide, and fans can't wait for the fourth season. However, the chances of confirming the date soon seem unlikely. Benedict Cumberbatch and Martin Freeman, who play Holmes and Watson, respectively, have extremely busy schedules, so they have not had time to shoot Season 4 of "Sherlock." The two are also working on separate projects of their own, making it even more difficult to find time for both of them to work on the hit series' much-awaited return.

Although the show has been notorious for two-year gaps between each three-episode season, fans are hoping and pushing for an earlier release date for Season 4. While a number of critics have questioned this unique pattern and how it might harm the show's survival, creator Steven Moffat believes the special wait times will make the show that much more likely to last. Incidentally, production takes a long time because the show uses sophisticated techniques to capture its striking scenes.

Meanwhile, show star Cumberbatch has reportedly been seen dating Dakota Johnson, star of the upcoming film "Fifty Shades of Grey." Rumors of him dating a new girl have been circulating for months, but Cumberbatch has not confirmed them. An insider told Showbiz Spy last month that Cumberbatch had a new girlfriend. Cumberbatch broke things off with his girlfriend in 2010 after more than a decade of dating, but they remain good friends.