Looks like 'Goblet of Fire' is going to be released November 18, 2005. Cool, I'm looking forward to it.
I know I can't be the first person to consider it, but it occurs to me that it takes about 2-3 years to get a major release movie out these days. And the Harry Potter series follows young Harry's life a single school year at a time, so the actors are aging at least twice as fast as the characters are supposed to. That means that they'll either have to get new actors to portray well recognized roles (James Bond fans should recall the warm reception post-Connery George Lazenby got), who hopefully will look/sound/act the same or else we'll be looking at a Hermione who's on her second marriage or a Ron with five o'clock shadow.
Come to think of it, the movies have been so lucrative and Rowling hasn't actually finished writing the remaining books in the series, she may wish to incorporate the the actors' condition into the stories themselves at this juncture. Book 6 could be titled 'Harry Potter and the Magic Ministry Pensioner' or 'Harry Potter and the Enchanted Dentures'