Unless I haven't made it clear enough in previous comics, Joan is Queen.
And yes, that was a jar of severed ears.
When Victorian era Holmes showed that he engaged in certain vices in both Sherlock movies, I was tickled at the thought of what Joan might have to say about that. This harkens to a season one episode where Joan makes an awesome speech to CBS Sherlock's former drug dealer who decided to crash at the Brownstone. I think that was the moment I truly fell in love with Joan Watson.