And maybe I'm getting cynical in my old age but I don't expect "friends" to refer to anyone other then Strax & Co.
No! It's going to be every companion going all the way back to Ian, Barbara, and Susan!
Okay, seriously, yeah I agree with you that it's likely just going to be Vastra and her gang. I'd also add River in there, though that title has me wondering. I'll still be surprised if she's not in the episode, though.
Also, I noticed they have changed the title of Gaiman's Cybermen episode.