These seriously are the spoilers. Don't highlight them unless you want to ruin the new book. Deathly Hallows, I mean. I really ruin the book, this is just about every spoiler in there that was left unsolved beforehand.
Harry is a horcrux, on accident, though.
The Deathly Hallows are powerful wizarding items, and we've seen them all already. Harry is the only one to own all three at the same time, though only in this book.
Dumbledore is ashamed of his past
Hedwig dies
Moody dies
Dobby dies
Fred dies
Percy reunites with his family
Scrimgeour dies during the wedding
Lupin dies
Wormtail dies, by his own silver hand
Harry's wand breaks
Harry thinks he dies for a little while
Harry ends it by casting the same spell he casts against Voldemort in book four, which reflects Voldemort's spell, killing Voldemort
Harry and Ginny get married, have three kids, Lilly, James, and Albus
Ron and Hermione get married and have two, IIRC. The names are unique
Snape is good