The last couple of trailers for Harry Potter and the Half-Blood Prince have been (nearly) all about the darkness. Responsibility weighs heavy on the Harry's shoulders, as the chosen one faces off with a rising tide of evil.
There is another side to the Half-Blood Prince though, and this more playful and romantic dimension is one that director David Yates highlights in an interview with Sci Fi Wire. The movie is, he quips, "actually about sex, potions, and rock 'n' roll." It is about "a wonderfully fun, slightly rebellious, quite naughty stage of teenage life." While the last film left off at the first kiss, Yates says:
This film is a bit more sexualized than that. You know, in a way. We don't see sex, but it's kind of in there. And the relationships are a bit more complicated and romantic and convoluted. So we're pushing into new emotional and kind of physical territory for Harry Potter.
Is he worried that fans might not be ready to see this more grown-up side of Harry Potter? Yates doesn't think so, suggesting that part of what is so interesting about the series is that the characters do grow older and change. The fans have been growing up with Harry Potter, and he expects that one of the things they are looking forward to is seeing how the characters develop.