The air date was cleverly revealed by the BBC having a hearse drive around popular Sherlock sites (Baker Street, St Barts, North Gower Street) with the air date as a floral arrangement in the back and the hashtag #SherlockLives!
Following the premiere of The Empty Hearse on New Year’s Day Sherlock will switch to Sundays for the remainder of its run meaning that we get two episodes in a week! The Sign of Three will air on Sunday 5th January and His Last Vow will air on Sunday 12th January.
The BBC have also released the synopsis for 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…
Thanks to @kirk_skirk on twitter for the photo.