It's just a remix, and it's not a big deal like a part of something big like Reanimation or Recharged. I don't care that much. It was a fun one. Most of the remixes for rock/metal songs these days are awful, but this one sounded fine to me. If they keep putting out new remixes, it's gonna be a great opportunity for a lot of artists to be introduced to people via Linkin Park, and I totally support that.
I get what you mean by that, there are some obvious similarities with the vocals. However, BMTH's song with Babymetal is a production masterpiece!
I don't think it will. I guess it was just something with added sound effects to make it feel like a trailer song. There are things like this in almost every movie or game trailer.