A strong, central Dunyain character to lead the series would be boss. Dunyain made this series of books for me, and if Achamian, his child or Mimara is to lead the last set of books, I'll be gravely disappointed. Crabicus to the rescue! Also, on that point, more on the origins of the Dunyain; why they've adopted their methodology and etc. I feel like there is still some mystery there.
Other than that, a relatively happy ending. Much atrocity is bound to follow, and maybe the world will be massively messed up, but I do hope that at the end of it all, it shall be saved.