Afraid of alienating die-hard Muggles by cutting scenes, the studio and scribe initially had talked about breaking the [Goblet of Fire] book into two separate films to be released in the same calendar year, à la The Matrix Reloaded and Revolutions, but Warners has now opted for a single movie.
The question now, of course, is: exactly how long a single movie?
UPDATE: According to CBBC Newsround:
Sources say Steve Kloves, who adapted the first three books, has been asked to make a single two-and-a-half-hour film.
Also - regarding the casting of the trio, the next paragraph in the article reads:
A rep for Warners said the studio will likely bring back the franchise's aging kid stars -- Daniel Radcliffe, Emma Watson and Rupert Grint -- for the fourth adventure, but it's possible filmmakers may decide to recast. A separate announcement regarding those roles will be made soon.
Finally, the story claims Mike Newell, the chosen director for the fourth movie, will make $1 million for his efforts. A far cry from Daniel Radcliffe's estimated $3 million salary on Chamber of Secrets and fellow fantasy film creator Peter Jackson's $20 million payout for doing the remake of King Kong (slated for release in 2005), but still very respectible.