Bow could be a bow of a ship too, or what you fire arrows with
There would be bunches of possible meanings for b-o-w here, except that kostgard on another forum posted this:
Folks who were at the event said it was "bow" like "Take a bow"
I assume that's referring to how Moffat pronounced the word. So that eliminates, e.g., bow and arrow, violin bow, ribbon bow, bow tie, rainbow (etc., I'm sure!), and narrows it down to take a bow or bow to authority (or other related meanings) and ship's bow.
If one wants to go with the giant rat angle, one could imagine an interesting combination of The Empty House and ... The Sign of the Four that plays off a large rat creature. If Wedding refers to John's wedding, the Sign of the Four is the story that sets it up.
Interesting. Have been meaning to read that one anyhow.
The Doctor wrote:
But didn't they tell the plane fangirl they wouldn't marry John?
Here's that bit from Emma's blog:
... I had a sudden attack of fangirl feels when I was chatting about series 3 with Mark and I kinda blurted out ‘Please don’t marry off John Watson!’ and he just smirked and said ‘I’m not going to marry John Watson!’ and I died.
... which I take to be Gatiss saying that he himself would not marry John!