In talking about "Doctor Who" season 8, Steven Moffat had a few more tidbits to say regarding its progress, and the return of characters like Clara, Vastra, Strax, and River Song.

"The scripts [are] coming in, we know what we're going to do and how it's going to end, and what it's building to," confirmed Moffat during a Comic-Con interview.

In addition, Moffat is confident that the transition for the 12th Doctor, after Matt Smith's exit, will be a smoother one.

"This time I've made sure we've got a bunch of characters around him so that we can have a new Doctor introduced and we can push that Doctor a bit further if you've got a familiar world around him," he said according to DoctorWhoTV.

And although it is not 100 percent cemented, Moffat hinted at the return of Clara (played by Jenna-Louise Coleman), Vastra, and Strax for "Doctor Who" season 8.

In talking about the 12th Doctor, Moffat said that the search had "barely begun" for the season 8 role.

"You don't want to be doing that while the media fury is going on...you kind of want to sit tight while that's going on."

So despite many speculations regarding the next Doctor, it seems the search will continue for a while before the Christmas Special.

And a particularly intriguing question arose over the potential return of River Song to season 8.

"I mean we can see her again because everything's out of sequence and clearly the implication is that she's met more than two Doctors. But the question is whether or not we should revisit her. It'll now be story-driven," concluded Moffat.

"If we've got an idea that she fits into perfectly then there's no reason why we can't do it, but I quite liked where we got to at the end of 'The Name of the Doctor,' with him saying goodbye to her. So we'll see."