It's interesting that the guests and fans on the BBC and BBC America post-episode shows were so breathlessly hyped up about "Deep Breath," and talked about its most pleasing surface features, its cute, exciting, touching and tweetable moments, so the show succeeded on that level immediately. The opening image (a dinosaur in Victorian London, spitting out the Tardis) got predictable wows, and everybody loved Peter Capaldi as the Doctor.
There are these writerly, even classical moments of reflected meanings, as when the Doctor (apparently asleep) seems to be vocalizing the thoughts of the dinosaur roaring outside but ends up saying something that's about himself, identifying himself in some sense with the dinosaur, as a stranger and perhaps--in a way--as old.
Then when he confronts the android (derived from yet another Tennant episode) who is a machine remaking itself with human parts, he accuses him of not even remembering where he got his face. To emphasize the connected point, he's holding up a shiny metal tray to the android's face as a mirror, but we can also see the Doctor's face reflected in the other side. (Mirrors as well as various kinds of reflections and projections are prominent in this ep.)
You've changed so much and so many times, there must be very little of who you were originally, the Doctor shouts, in a nice piece of projecting, so you wonder if he's not wondering if that's his fate as well.
Besides the Doctor talking to Clara, he's speaking for many older people, who may no longer look like the person they feel they are inside. Younger people do tend to look right through them, but even worse, they don't see who they are.
Meanwhile in Trekville...
Speculation and consternation continue as, soon after the new director for the 2016 official NuTrek feature film was announced, so were the new writers. Consternation seems natural, whatever the gifts of the people newly in creative charge, since 2016 happens to be Star Trek's 50th anniversary, and so far there is no clear connection to that living legacy. Even Abrams' Trek films had a connection through Leonard Nimoy. Now so far there's nothing, except rumors of cameos. Meanwhile there are all these talented and experienced directors, actors etc. whose lineage goes back to Gene Roddenberry, who know what Star Trek is about, with many of them quite eloquent on the subject.
Doctor Who seems much more active in revisiting its past, in creating new stories for past characters, and especially in using actors from that past. That's largely through an emphasis on audio/radio drama, something that Star Trek has never really done much of.
Alien Voices and L.A. Theatre Works. But official Star Trek has not embraced this medium. Which means that those great voices out there associated with various Star Trek series are not doing the new stories they could be doing, adding to the Star Trek legacy as well as reviving it. Instead, we get the Star Trek cuckoo clock.