Theories about book 7.
Deathly Hallows: perhaps refers to the places where the horcruxes are kept, based on the fact that a hallow ground is a sacred ground and thar "for voldemort his hocruxes are sacred"(Kimimaro). Also the french title word replacing hallows for the moment is sanctuaires (sanctuaries in english) so... perhaps its where the horcrux are stored. Deathly well because the places are likely to be secured by lethal maners.
Potions Book: The HBP potions book the one harry hid will have an important role to play, unknown if its Harry or somebody else (good or bad) who will stumble on it.
The wedding at the Burrow will be interrumpted.
Ron may die in trying to protect the one he cares for the most.
Anyone gave a thought that perhaps dumbledore like all the previous great wizards is gonna have a picture of him hug around hogwarts and that the picture will be able to talk an move about and give counsels to harry and to sleeperver else?
?
McGonagal is gonna be made head mistress or else it will be some stooge of the ministry who will be rapidly kicked out like Umbridge was.
Hermione will be made Headgirl and probably Ron headboy, dont think harry can be as he isnt even prefect.
No quidditch this year.
Its possible Harry doesnt even return to school (he can legally leave school as he will be major) and heads over to headquarters directly after leaving the burrow and works from there, however i think he will attend school.
A new DA teacher??? dont know it sounds dubious maybe No DA classes at all.
Major revelations about Percy Weasley i still personally think he is role playing about being a stooge of the minister as he simply adores dumbledore in the first few books. Its unlikely someone would change that much in their relationship towards their hero.
more deaths.
Neville botany knowledge comes in helpful.
Dementors back again.
The mirror given by Sirius to Harry places a major role. NO am not saying sirius will be involved.
Peter pettigrew repays his life debt towards harry for saving him.
The truths about Snape and Lily.
Slughorn's Aragogs venom which he collected has an important role.
Buckkbeak used again
Firenze accepted back into the herd.
Lord voldemort lives, though it might be somethinmg worse than death as mentioned by dumbledore.
Harry potter dies trying to protect something
the secrets of godric hollow will be out.
harry might come into inheritance of something now that he is major.
the sword of gryffindor and fawkes and the sorting hat are gonna be important in the course.
Revelation as to who is RAB exactly
The number of soul pieces are 7
so meaning there vessels are 7 which are
Diary: status destroyed
Slytherin ring: status destroyed
Slytherin locket: location unknown: possibly same locket as at head quarters: status unknown: it may or may no longer be a horcrux.
Nagini: location next to voldemort: status alive and kicking uhh sorry slythering
Hufflepuffle Goblet:Location unknown: status unknown probably still intact unless RAB has already striked.
Ravenclaws item (probably the tiara seen in the room of requirements and which appears still intact. OR something belonging to gryffindor which is highly unlikely but which might be and since the only known relic of Gryffindor is his sword ...
The seventh vessel is Voldemort himself
Voldemort cannot be killed by wand of harry atleast not in duel so his desmise will have to be brought by an indirect manner and same it is intriguing how voldemort will kill harry
whats happens after the war.
there are lots am missing here.
However i think lots of aspects will NOT be covered and others neglected outright since i hear the book will be much samller than even HBP somebody suggested like between PoA and GoF and i sincerely believe than to cover all the material remaining and to wrap up all the loose end a book of the size of OOTP or bigger would be a must. But am not the writer
Disclaimer: The above are my opinions ab=nd delusions and do not constitute the views of eitherJ.K.R or Bloomsbury or Warner Bros or any other official or unofficial entities linked to the Harry Potter world.