Another New Interview
This one is from CBS, and has Emma Watson and Daniel Radcliffe.
And it seems, as Daniel has a pretty good grasp on some of the big difference the fourth book/movie had to the previous three. He had this to say (amongst other things):
"The first two films are about the strength of everything, the strength of relationships, of how Harry sees everything," Radcliffe says. "The fourth film is very much about all of that weakening and starting to disintegrate, so Harry's relationship with Ron is very shaky for a lot of the film."
Check out the full interview HERE.