As promised here are the predictions or thoughts or whatever you want to call them that a couple of friends and I came up with after reading The Half Blood Prince.
V initially came up with the questions and then J and I answered them. Any alternative thoughts welcome...
Is Dumbledore really dead?
V - Yes
J - I agree but may come back as a spirit guide/voice inside Potter's head. No star wars connection there then
RS - Yes but will still play a part as he will have a portrait in the headmasters office at Hogwarts so Harry will be able to talk to him
Is Snape a "goodie" or a "baddie"?
V - A baddie
J - A goodie for sure
RS - A goodie, it would be too obvious if he was a baddie
Did Dumbledore intend for Snape to "kill" him?
V - No
J - No but gave him permission to do so if necessary to preserve his cover and anyway Dumby told him by telecommunication that he was dying anyway so he should feel free to go ahead.
RS - Based on my former answer then I think yes, and I like J's suggestion
Is Harry one of Voldemort's horcruxes?
V - Yes
J - Nice idea but no, too risky as Voldemort thinks he has to kill Potter - though perhaps he became a horcrux before Voldy knew about the prophecy or by accident? On balance I think not.
RS - I don't think so but it would be an intriguing twist if one of his friends was and he had to kill them
Where are the others? (V's suggestions and J's and RS's comments)
1 - Diary - dead
2 - Slytherin locket - dead
3 - Sorting hat J - Nice idea, I'd go with that RS - Not sure about that, why'd put Harry in Gryffindor where he can gain protection from the sword
4 - Somewhere in Hogwarts J - I'd go for the Gryffindor Goblet RS - I'd go with that, there are the other house mascots too although I can't think of them at the moment but it could be anyone of them
5 - Harry /Neville J You are forgetting the snake RS - Yep I agree but it could still be one of the kiddies
6 - Voldie himself J - No he's merely the seventh receptacle, what about Dumbledore's phoenix? RS I don't think he is and surely Dumbley would have worked it out if his phoenix was one?
RS suggestion: was there a box or something in Sirius' house that they found when they were tidying up during the Order of the Phoenix that no one could get to open, could that be one. Why mention it otherwise?
Is there more to Petunia than meets the eye?
V - Yes. She's a witch, pretending to be a muggle, albeit not as good a witch as her sister Lily was
J - She will have a role to play in the next book but not this, I reckon she will come good by giving important detail about her sisters death
Will Voldemort die?
V- yes of course, Harry will find some way of removing the Tom Riddle part of his "soul" from him without topping himself.
J - I go for full out slaughter
What will Harry be when he grows up?
V - One of the following 3 options: (1) an Auror, (2) defence against the dark arts teacher or (3) the headmaster of Hogwarts. Of the three, I'm going for the latter, albeit eventually, and that he might need to start with being defence against the dark arts teacher
J - Agreed
RS - That is of course if he lives and I really want him to live and become an auror like he always wanted to. I reckon he'll get injured in someway which will stop him from being an auror and so he'll eventually become headmaster of Hogwarts
Who will marry whom of the main protagonists?
V- Harry + Ginny; Ron + Hermione
J - Could we just have a bit of sex without this marriage bit?
RS - If they all live then I agree with V but that might be a bit too happy-ever-after for JK Rowling, if Harry survives it will be at a price and that could be Ginny, Ron or Hermione
What will he/his mates do when they grow up?
V - Harry= future Dumbledore; Hermione = Auror (J - Unless she gets to be headmistress) Ron = ministry
RS - I'd agree with that
Who is RAB?
J - Clearly related to Sirius. Does he have a brother or father called Reginald or a nick name?
RS - (and I'm cheating a bit now as I found this out after we had originally answered these questions) It is Regulus Black, Sirius's brother who apparently went over to the 'dark side' then realised his mistake. If my memory serves me he is thought to be dead. Sirius mentions him to Harry when he is showing him the Black family tree at his house.