The airing date has been announced as January 1st, 2014 for BBC One and January 19th for PBS . The second episode and third episodes will air on January 5th and January 12th on BBC.
Official synopsis of the first episode titled “The Empty Hearse”;
“Two years after the devastating effects of “The Reichenbach Fall,” Dr John Watson has got on with his life. New horizons, romance and a comforting domestic future beckon. But, with London under threat of a huge terrorist attack, Sherlock Holmes is about to rise from the grave with all the theatricality that comes so naturally to him. It’s what his best friend wanted more than anything, but for John Watson it might well be a case of ‘be careful what you wish for’! If Sherlock thinks everything will be just as he left it though, he’s in for a very big surprise…”