Rotten Tomatoes has another great Chris Weitz interview posted. During this interview, Chris talked about the New Moon soundtrack, among many other topics:
Read the entire interview at Rotten Tomatoes!
"Alexandre Desplat has just started working on his music for the film, and we are just starting to put together what bands are on the soundtrack, so it's kind of like keeping ten plates spinning at once," Weitz said. "But it's all good, because we've got Alexandre Desplat, who I think is one of the greatest film composers living, and because of the strength of the franchise that I inherited, a lot of bands are really interested in working on the soundtrack."
When asked about "Bella's Lullaby," Weitz confirmed that it would reappear -- at least, in some form. "I think yes, because like any franchise, there are certain themes that become familiar. I suspect he's going to transpose it in some manner, and most of the music will be entirely new to the franchise because his style is somewhat different from Carter Burwell's. But I think that there is some value to having some kind of familiar leitmotifs running through the entire series."