Arcade Fire's Where the Wild Things Are Soundtrack

I'm going though "Needing Work" articles and started looking into the alleged soundtrack for Where the Wild Things Are written by Arcade Fire, and I came upon something interesting that I'd like some outside opinions on. I found an article from 2008 that reported on a preliminary screening of the film which contained temporary musical accompaniment of songs by Arcade Fire, as well as the Yeah Yeah Yeahs. At the end of the article, the author notes that the two bands' music will not be part of the film when it releases, as the music was just temporary. While this could be enough to say that there was a misunderstanding and possibly the preview version of the film plus the use of one of Arcade Fire's songs in a trailer was the source of these rumors, the waters are somewhat muddied, as the film's music ended up being written by Karen O, who is a part of the Yeah Yeah Yeahs. I should also add that there doesn't seem to be any information on Arcade Fire writing the soundtrack for Where the Wild Things Are. All I can find on their involvement in the film's music starts and ends with the trailer using a new version of "Wake Up" (for which the full version is a confirmed lost piece of media).
This brings me to getting the input of other members from the wiki:
Would this information be a substantial basis for saying that there is no Where the Wild Things Are soundtrack written by Arcade Fire?

Here is the 2008 article, with the information about the music for the film in the last few paragraphs.