All in all, I loved the episode. But...
As much as I love Vastra, Jenny, and Strax, I'm not quite sure why they received so much screen time that wasn't crucial to the plot. I know part of it was to show off their "sonic devices"- Vastra's hatpin, Jenny's gauntlet, and Strax's lorgnette. Those nifty props were the winning designs of some really talented kids who entered a BBC contest. Part of me also hopes it was to gauge audience reaction, as I know a spin-off has been discussed, at least among the fans. I would watch the heck out of that.
As for the nature of Vastra and Jenny's relationship, I agree that it's probably a political statement of sorts. Moffat has been taking a lot of flak for his portrayal of female characters lately. Not to mention that classic Who featured strong women who were very into the equal rights of women. Vastra and Jenny kind of tackle gay rights and the strong female thing in one fell swoop.
I'm also very bored with Moffat's pandering to the fandom. He did it all throughout the Christmas special with the shaved head/eyebrows gag, and the letting Matt's Doctor get old and live a full life so the fans wouldn't feel like he was being taken too soon or whatever (at least that's what it felt like to me). And now he does it with the "accept me for who I am now" routine with Clara. I understand that the show has reached new popularity levels with all these new young fans that are in love with their hot Doctors, but when you basically stop the show for a while just to send a message to all those fans, or even just to make a joke (as with the "delicate" eyebrows), you lose integrity. Next he'll just be picking up some fan fiction and making episodes out of that.
Am I being too mean? I'm sorry, I'm getting tired, and it's been a while since I've gotten to rant and/or rave about Doctor Who.
Other than that, I loved it. Very curious to see where they will go with it. So many references and possible clues! I'm also amazed at how easily I just accept Capaldi as the Doctor without reservation. I attribute it to his love for and familiarity with Doctor Who, and also to the fact that I've been catching up with classic Who, and have been through several regenerations recently anyway.
P.S.- I have no idea how to punctuate around parentheses, so apologies if I've offended any grammar fanatics out there.