Therefore our only (unspoiled!) prediction for Book 7 is that it will have a major character named Pike in it, that being the name of the last of the Sandy Hook disappearing gun batteries. (Yes, 'disappearing guns'. We've also decided that the old fort is the site of a major part of NYC's magical defenses, given the number of 'very dangerous, Muggles keep out' signs all over the old installations.)
Less awesome: We have belatedly realized that it might not be the simplest thing in the world to get a reasonably-priced hotel room on the Jersey shore in July on a Friday night without a reservation. So we may end up sleeping in the car and/or our grandfather's spare room tonight ... wish us luck.