DarkMark has received an e-mail from a "reliable source" concerning current filming on Harry Potter and the Prisoner of Azkaban and book six:
Do not believe the rumors about PoA being "sexed up." The film's script reflects only what JK wrote, no added relationships will be thrown in the mix.
The first trailer is completed and expect to see a special 30 second clip of it to pop up soon.
In regards to book six:
Word around work this week, is that JK publicly said "Harry sustains a minimal but lasting injury in this book." It is also reported to be roughly just under the length of GoF and will most likely be done by early January (the first draft).
We haven't heard Rowling say anything publicly about book six, so as always, treat these as rumors until they are confirmed.