At the 2:30 mark on the trailer, during the Yuffie and Red XIII combo, you can briefly hear someone saying what sounds like "On my way"
Someone took the music out so you can hear it clearer. Sounds like a Scottish accent to me, so this is definitely Cait Sith
Someone took the music out so you can hear it clearer. Sounds like a Scottish accent to me, so this is definitely Cait Sith