Unfortunately, if we assume that Outer Moka isn't going to disappear in the current arc, I don't see Outer Moka appearing anytime soon...
After all, for Outer Moka to become the dominant personality again, the Rosario would need to be repaired from it's current weakened state, and since Inner Moka has left with Akua... the Rosario won't be repaired anytime soon, since it's probably going to take some time, before Tsukune is going to take Moka back...
Of course, there is always a possibility that both Moka's are gonna merge in the current arc (which, is already quite large, to the point, when I'm starting to wonder if we shouldn't start dividing it ... into some sort of sub-arcs or something similar to that
), but that's something for Ikeda to decide on... since currently... besides the events of chapter 27, there is nothing pointing foreword that...
On another topic ... I' had a strange idea recently, about how Tsukune might try to catch up to Moka and Akua...
I mean that, it's very probable that in the next few chapter's Tsukune is going to go through some kind of development of his vampire abilities...
So, what is you're opinion about the possibility of Tsukune receiving an similar shapeshifting ability as Kahula, though rather then transforming his arms ... Tsukune is going to grow some bat wings from his back...
I know that it sounds pretty weird, but who knows ... it might happen, and if something like that happens, Tsukune would be able to go after Moka on his own... without needing Hokuto's and Kiria's help...