Before this, I've heard that the first word of episode 3's title is 'His'. Then when I also hear that the title may turn out to be 'His Last Blog', my brain is immediately flooded with images of Martin's John in grave danger... My poor heart...
So it turns out to be 'His Last Vow'. Whew. Because if it's really 'His Last Blog', it sure has something to do with Martin's John Watson. Whatever it is, it sure sounds like someone's going to die... >_< You can find full article here:
Full article here: http://www.hypable.com/2013/07/19/mark-gatiss-tried-to-get-benedict-cumberbatch-on-game-of-thrones/
Also check out this video of the Sherlock panel at Comic-Con: