Sherlock has changed - he's far more animated in this episode than he has been before, and if the trailer posted earlier in the thread is anything to go by, it's a trend that will continue. I don't dislike it, but it'll take a bit of getting used to.
Great episode tho, thoroughly enjoyed it and I'm planning to re-watch it today.
Couple of minor niggles tho - I'm a little disappointed at the explanation - seemed a bit too mundane for my liking. Although from th reaction to Anderson, it might not be the complete story anyway. I do hope if there's more we get to find out in a later episode.
And also - Moffatt and Gatiiss said -
1) There was a clue that everyone missed, and
2) Sherlock acted very out of character in TRF, and that was a clue as well.
For the life of me, even after seeing the "explanation", I can't work out what they meant - any ideas??