Hey, anon dear! To be honest, yes, I believe so! I believe all the Taka will be in the new movie, to be honest.
With the recent development of the manga and knowing some of the works Kishi enjoys (be it movies, books, mythology and whatnot), I certainly believe that Sasuke, Karin along with the other members of the Taka will be present in the movie.
To be honest, at first, when I saw the panel where Suigetsu says they can rule the world with that scroll, it made me wonder why such statement. Of course, we find later that it was the way to invoke the past dead hokages, but if we look at it now, with the eyes and information we have now, this statement might hold more meaning to it.
As we saw, Sasuke declared that he wants to revolutionize the Shinobi system. Like I said in one of my previous posts, I highly believe Sasuke isn’t gonna die, that would ruin the purpose of the story in a way and Kishi has shown us via Hashirama and Madara that Hashirama killing Madara didn’t help in any way, so this new generation will find the proper resolution.
Now, given the information we know about the last, imo, it’s a transition movie towards Part 3. I fairly believe that what Kishi wants to do with Part 3 is expand a little bit more this ideology that Sasuke and Naruto have, both of them wanting in a way the same thing but via different methods.
What I believe Kishi will do and the reason I say that yes, I believe Karin along with Sasuke and the rest of the Taka will have a part in this 3rd part series, is that he will form like two separate entities in terms of ideologies and Naruto and Sasuke will keep fighting. Naruto will have Konoha and the others, while Sasuke will have support from Taka.
People have believed Taka means nothing to Sasuke, but it’s wrong to think that imo, especially given the new information. What do we know Sasuke hates the most? Today’s shinobi system. Why? Because he, personally, was a victim of that system. Who else has been a victim of the system? Yes, the members of Taka, them being the supporters of Sasuke’s ideology and maybe, who knows, new characters, depends where Kishi wants to take this and who will sympathize from the series with Sasuke’s actions, though I give you, this is a tricky one.
As for Karin, we know her love for Sasuke, as crazy as it is, it’s there and represents a big part of her character, besides the others, such as being an Uzumaki, a war orphan and whatnot and given that Kishi seems to be pushing things in the direction of two revolutionary shinobi systems stemmed from two different ideologies, aka Naruto’s one and Sasuke’s one, of course each of them will have its supporters, Karin and Taka being Sasuke’s most important ones, given the similar experiences they’ve lived, especially Karin’s one which is an Uzumaki version of the Uchiha massacre.
So yes, with this being said, I do believe Karin will be in the new movie/third part of the series (if we’ll have one). :)