Hmm, I’m not sure where they’ll go from here!
I didn’t do too much analysis of S8 actually. Overall, I had a lot of issues with the story arc even though I loved Twelve and Clara more than Eleven and Clara. I felt like there were some VERY strong moments and then there were some letdowns. I felt like Danny wasn’t given the story he deserved, I felt like he got shoehorned in and shoehorned out like a convenient plot device, and it really wasn’t fair and sits really bad with me. I feel like Clara didn’t really go in the directions I thought she’d go in and I wasn’t quite satisfied with what we did get, I feel like Capaldi didn’t get writing that quite did him justice for all he could have done with his character. I’m thankful we’ve got another season with the both of them, at least.
After S7 I had some ideas where the narrative was going, and some of those thoughts were confirmed - but some of them really didn’t live up to the story of S7 for me. I feel like S7 really was a stronger narrative, but a lot of people don’t realize because they either weren’t into Clara and Eleven after the Ponds, or they saw Twelve and Clara’s incredible chemistry and felt that was sufficient storytelling.
I feel like Last Christmas definitively indicated that they felt romantically for each other and both were aware. The anti-shippers are far quieter now that it’s pretty much confirmed. I don’t feel like it was the BEST way this relationship could have been written, and there are things that still stick in my craw, but hey. I don’t know if they will eventually move into a romantic relationship, but I feel like where they left it off might have been conclusive in that perhaps they know how they feel but do not feel they need to act upon it.
The Doctor realized that he could have missed out on the rest of her life and considers where they’re going now a second chance, which is a HUGE thing character wise, considering Twelve was born inheriting the emotional isolation of Eleven’s grief and loss in TTOTD. Eleven’s character arc with Clara was all about his fear of loss, and Twelve was a more raw and isolated manifestation of that very thing. Last Christmas left me with the feeling that he’s finally graduated past this, and that he’s going to let Clara back in again. He saw what it was like to miss those 63 years of her life, and he recognizes how important this second chance really is.
I would even argue that this may be the first time we see the Doctor really stay for a companion, and Clara’s story may very well end with her dying of old age, with him having lived her life with her. It seems fitting considering all the themes surrounding this in S7 and 8.
So I don’t really know where they’re going now. They might expand further upon these themes and develop the relationship more, or perhaps they will expand upon Clara’s increasing complexity/darkness/power, which could be interesting (or disastrous if we’re being pessimistic).