I doubt it would get an 'R' rating! I'm sure what David meant was that it goes much deeper into the teenage romance issue...more than GoF did and possibly OotP.
(Although, I agree that HBP is much more intense than OotP...even if Yates was talking about emotionally.)
I just hope that they finally do Ron justice like they did in the first two films. I'm sick of Ron suddenly becoming a minor character, a character only there for laughs.
And, of course, as long as we've got R/Hr, I'm good.
Shannon