I'm not sure exactly when the sixth movie is due out (I could look, though I am more interested in the Pitt vs. Marquette basketball game right now), but would guess since they are currently filming Half Blood Prince it would be this summer or nearer the holidays.
In the meantime, here are a few links to Deathly Hallows information:
- The Leaky Cauldron: Harry Potter Books, Movies, and More
- David Heyman Talks Splitting Deathly Hallows, Both Films Possibly Two and a Half Hours Long
- Empire Magazine Article: David Heyman
- Deathly Hallows" To Be Split into Two "Harry Potter" Movies: MTV Movie News
- UK The Daily Mail: It's Harry Potter and a film of Two Halves
- Final "Harry Potter" book will be split into two movies - Los Angeles Times
- Harry Potter and the Deathly Hallows - Trailer, Cast, Showtimes: New York Times
It's early yet, but Pitt is winning!
Update: later that evening ...
I could not let it rest. According to the Internet Movie Database, Harry Potter and the Half-Blood Prince is due in theaters November 21st. And ... Pitt is still winning.
From Library Journal - Book News: Rowling's Deathly Hallows Split into two Films
From RTE Entertainment: Final Harry Potter film to be split in two
"According to Warner Brothers, it is with the length of the novel and the complex storylines in mind that Rowling, the movies' producers and the studio decided they would need two parts to tell the story."
"Daniel Radcliffe, who plays Harry in the movie version, and his co-stars Emma Watson and Rupert Grint are all filming the sixth movie 'Harry Potter and the Half-Blood Prince'. All three have confirmed that they will appear in the final films." --RTE Entertainment