now that 21st July has been declared as the annointed date..i've had little else to do except read up on all old HP and try to gather all the clues to the seventh one in one place. Given the fact that Rowling usually introduces an innocous little thing in one book and uses it quite strategically in any of the next few ;

bezoars being a good example here; introduced in book 1; used in book 6
the opal necklace, Borgin's Shop in knockturn alley from book 2, used again in book 6
wolfsbane book 1, used from book 3 onwards

I am sure there are plenty of cross-references that any causal fan can dig out; the point being that Jo obviously likes to tie down loose ends.

which brings me to the reason behind the post. Since all the previous 6 have been published, the only references which have not been crossed out till now, will eventually have to be used in book 7...

One of them, i think is the "immensely complex Homorphus Charm", which is used to turn a raging werewolf back into a human form, without using a (lesser) complicated potion.

Another can be the Malfoy Castle's "secret chamber under the drawing-room floor"; surely there are more than a few dark secrets abounding in that.

Both references from Book 2: Chamber of Secrets. Another reference between CoS and OoTP, is in the dueling chapter; where Lockhart shows Harry how to defend himself against an attack .."a complicated manouever, by the end of which he loses his wand" to the complex wand movement that ol' Dumbledore uses in he ministry of magic to defend against an attack by ol' Voldy.

By far, the most profitable line of enquiry, as stated by Jo herself is; " Why did Dumbledore have James' invisibility cloak, given that he could make himself invisible even without that?"

Some more twisties that i've been thinking about lately:
1. Where is Godric's hollow ?
Given that its diectly on the line connecting Bristol (Harry sleeps over Bristol in the midnite bike ride with Hagrid) & Surrey (Little Whinging)
2. How's the Fidelius Charm holding up ?
Was the charm used for protecting the location of the house or its occupants also? In case, it was the occupants, it should still be working because both the secret keeper and the protectee (harry) are alive.
3. Who will show Harry the location of Godric's hollow ?
Or will he know it himself. Certainly, the only people who'd know where Godric's hollow is would be Potters, Sirius (?), Peter Pettigrew & Voldy.  So, either  Pettigrew will repay his blood debt, or Voldy would set up the house for a final showdown. We already know that Voldy's a sucker for places of significance. And the choice is pretty much between Hogwarts as a battleground or Potter's house.
4. Who is R.A.B? (duh!)
Not wasting my breath on this one. Remember the last time how Jo cleverly used the description of Scrimgeur (lion's mane etc), in the publicity for the HBP. And the poor chap was barely scratched in the book.
5. Snape ?
Good/bad/what ?

thats all the researching for today. Will keep updating as and when i find more.