Jason Reitman, who co-wrote the script with Monster House director Gil Kenan, said that there are surprises in store, but wouldn’t reveal whether the original Ghostbusters are in the movie.
It would be great to say that these reactions are indicators that these two actors will be reprising their roles for this new Ghostbusters movie, but this is still early days and this film does not have a cast yet and no official plot details have been revealed.