GET EXCITED: THE SHERLOCK CHRISTMAS SPECIAL TRAILER IS HERE. Brace yourselves, Cumberbabes. Benedict is back.    The fourth season of Sherlock won't arrive till at least early 2016, but the one-off Christmas special set in Victorian England is real enough to have a trailer. See the period-appropriate mustaches! See horse-drawn carriages! See Watson (Martin Freeman) give Sherlock (Benedict Cumberbatch) guff for not wearing the damn deerstalker hat! It's the same 221B Baker Street you've…
{}