I think that the new information 78 would give us to discuss ought to balance out the cliffhanger, no matter how large.

Also, I wonder if Harry might use the Headmasters conclusions about the return of the Dark Lord to request private lessons. Most likely not Horcrux-related lessons, but similiar to what Ron and Hermione expected Dumbledore to teach him in Canon. In this universe Love is certainly not Harry's Deus ex Machina, so Dumbledore ought to want him to be more competent in Battle Magic.