If ye want a real spoiler, how's this;
Clearly since they didn't kill off Harry, this "last book in series" is a clever marketing ploy. I foresee there shall be another, where Harry and his crazy friends get together to bring back Ron from the dead. The opening chapter could read something like:
The chick who's name I can't spell: "Harry, we did it, Rons alive again!"
Harry: "Good to have you back Ron! How are you feeling?"
Zombie Ron: "Brrrrrraaaaaaiiiiiinnnnnnnsssss....."
Everybody: "Oh Ron, ur such a gas ti...... oh wait!!!! AAARRRGGGGHHHH"
Now that's good reading!!!!!